Malicious PDF — malware analysis report

Static analysis result for SHA-256 915186770fdcb3d5…

MALICIOUS

PDF

79.4 KB Created: 2021-03-17 16:12:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0b901d3e4fb82a761bbf09f2aa688c43 SHA-1: dcfb123dbae3800df7d4ac6aeaa969f200357cbc SHA-256: 915186770fdcb3d51613953722377887e5d54e73d0202c4be8ff7c4e4c3f1760
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://xajibur.ru/123?utm_term=benevolent+fund+loan+form PDF link annotation
    • https://rozinezo.weebly.com/uploads/1/3/1/6/131636990/jevipaf.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/gUyeGQP/kixobujabejufuvivug.pdfIn PDF document text
    • https://cdn.sqhk.co/bepotedaxus/gf3idif/furuxob.pdfIn PDF document text
    • https://cdn.sqhk.co/wituruxa/Kjdhbno/14702821824.pdfIn PDF document text
    • http://tamakar.tech/60521759682v7doq.pdfIn PDF document text
    • https://nobibiraxofos.weebly.com/uploads/1/3/4/9/134904538/8744267.pdfIn PDF document text
    • https://cdn.sqhk.co/govovazeket/gjb6xia/icici_mobile_recharge_coupon_code.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/81110817283ck2xu.pdfIn PDF document text
    • http://digitalmicroteter.xyz/mantis_tiller_7225_coil9hos4.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/fepafiropowuvimpueen.pdfIn PDF document text
    • http://cookwellbakewell.com/samsung_galaxy_note_10_plus_user_manuale288b.pdfIn PDF document text
    • https://cdn.sqhk.co/sisagoku/ngiKicO/hit_or_miss_lyrics_jacob.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/varutavo-wakiso-sirufekisegit-pukobiti.pdfIn PDF document text
    • https://xazowivuxef.weebly.com/uploads/1/3/4/5/134513065/kokuwidewula.pdfIn PDF document text
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/5198601.pdfIn PDF document text
    • https://fagudigozupubu.weebly.com/uploads/1/3/6/0/136042622/0329f80256.pdfIn PDF document text
    • https://nemanuvipiza.weebly.com/uploads/1/3/1/3/131398236/sizajofugemazelo.pdfIn PDF document text
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/10c4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f5d69f-435f-4837-b4ef-98e0ab56b3b5/rehraas_sahib_path_download.pdfIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_9d719a73fb52425b92a23bd1c5c54884.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/530ca223-590b-4a03-9b8b-a57d1731b415/xomib.pdfIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_dc8c65105ba0480db2e791aff278b6db.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_1134522bb797465ea4ec76d1789af93d.pdf?index=trueIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_5798665ced934b51ab375eeb546973ee.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 4984 bytes
SHA-256: f2c40b0388ba26dfb87de8451a934ed2888c84455ff1db55b18cd637b0c4478d
font_01_sfnt_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 10916 bytes
SHA-256: 0d1d171d1426d3f2fa8fb93cba112bbcad6509c3087d13b13d9ed19e16c7b4bd