Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a4e1b3b1f0b4ca…

MALICIOUS

PDF

126.4 KB Created: 2021-03-30 08:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 47514f5c4737fa98d0c9aaf194343478 SHA-1: 4d21cb97dd2ea22b52add4de2c748a7550afba76 SHA-256: f7a4e1b3b1f0b4ca8cbdc130e55c0fdef99a0017ec8e95b182e47390d5613498
210 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of urgency and download lures further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/123?utm_term=gujarat+university+ccc+result+marksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424029/normal_5fc7dad9152c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487916/normal_5fdf052b02162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500678/normal_605d6c25230aa.pdfIn PDF document text
    • https://bowonusafepa.weebly.com/uploads/1/3/4/3/134319531/833b68f42.pdfIn PDF document text
    • https://lezanixopedem.weebly.com/uploads/1/3/4/8/134886347/taxod-vunatonigalanez-kibidi-jovor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470552/normal_601180ec1aed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420610/normal_600e23537168d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_602339f89f1e7.pdfIn PDF document text
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/3364428.pdfIn PDF document text
    • https://romidawuro.weebly.com/uploads/1/3/2/7/132712233/gufuludetikus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_5fe63049bd466.pdfIn PDF document text
    • https://tawedituja.weebly.com/uploads/1/3/4/8/134864040/5071603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485826/normal_60474625e3ff5.pdfIn PDF document text
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/f78dbc.pdfIn PDF document text
    • https://wabupakiwe.weebly.com/uploads/1/3/6/0/136057256/xegujirelowoxujurebi.pdfIn PDF document text
    • https://davokirik.weebly.com/uploads/1/3/0/7/130739121/b7fbeede764d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/gdb_pocket_reference.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/the_better_digitech_jamman_solo_xt_manual.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_94d2759c4e7d4e909d2b746a0e48239c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/11241934096.pdfIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_5444c1a0742641dc8ad02219ec861866.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/97404269652.pdfIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_ac6f8eae175c4fb584ce04f1fdaa92ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/tijowof.pdfIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_838d7527abd948ffb3ba4e1f77cb75cc.pdf?index=trueIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_639a9342d7d447da94cf752045a5caf2.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BC3 5372 bytes
SHA-256: 94e753692e772ba0bf513ca0e925e83fb1a9b147f7625ccddc5c71d544f8d427
font_01_sfnt_off00019deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DEB 5684 bytes
SHA-256: 2501f70a89f65cd47d9b9c4f2ad7e50bbfd445766bd01d80d836ea156d6223e7
font_02_sfnt_off0001ad8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD8D 11112 bytes
SHA-256: b53436100db03b05f5ad76ffc81f520110839a3c19d10e6843a6268692aa8c2c
font_03_sfnt_off0001d34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D34B 16696 bytes
SHA-256: d9c673429e3d6cc4dfd72d1f28ba0f6a0da4e96cd9e5c88bfd699bd0eeb28755