Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78a4dabe53ee302…

MALICIOUS

PDF

182.5 KB Created: 2021-03-14 16:22:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 11c4bc3713c3f6f2483c670b3bbf6ff4 SHA-1: 09408ae1b85973dbbb7e82eee33bdf6959571e1c SHA-256: b78a4dabe53ee302701f1b5dd39a9e833f4ec2e3854d7ebdbd3ba800e97eb1ec
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment 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 0.9994

Heuristics 6

  • 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 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://crophysi.ru/wix?keyword=pay+paypal+invoice+via+credit+card PDF link annotation
    • http://sfr-webmail.com/block_panchayat_secretary_2018_question_paperkjds3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492536/normal_602e28dc40700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489607/normal_60385a93a22bd.pdfIn PDF document text
    • http://numberoone.xyz/79745068202dqzhg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5ff5cf0b97512.pdfIn PDF document text
    • http://tasigezagu.scienceontheweb.net/how_to_run_a_test_meeting_in_zoom.pdfIn PDF document text
    • http://otomail.business/zofowibifixosakabafom12wjz.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/bVhhvdq/gebiwefulufojukatadi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469135/normal_60058257c8d4d.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/jvrgghj/mega_photo_pro_apk_new.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406170/normal_602e552f526bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_6022c63c966ed.pdfIn PDF document text
    • http://beritox.medianewsonline.com/swot_analysis_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/0hjbSg6/92824203524.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376086/normal_5ff0286e4a249.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366655/normal_600657aebca12.pdfIn PDF document text
    • http://hook-up.fun/innovative_teaching_strategies_in_nursing_education_pptyum39.pdfIn PDF document text
    • http://tactical-jacket-sale.shop/gulorujokow92hg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nunitew.rf.gd/30043809438.pdfIn PDF document text
    • http://futuwerelak.epizy.com/80707520986.pdfIn PDF document text
    • http://rejoxon.rf.gd/background_balloon_hd_images_free.pdfIn 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_off000290a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x290A0 5052 bytes
SHA-256: 5354bb45a6b4b8deeab46678f5891976d67ec595527a0163d93fa251eb9a03ff
font_01_sfnt_off0002a1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A1EA 12356 bytes
SHA-256: 843fb60837e934412300690fcd50caedc8892cb543a66a191cb14d671378c837

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