Malicious PDF — malware analysis report

Static analysis result for SHA-256 e94f54dca8eb79a0…

MALICIOUS

PDF

81.8 KB Created: 2021-04-13 06:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 553323f5ba99411e676f2f34d6a7b8b1 SHA-1: 105eebe1c560778e7f628d2f2aa7bf64f06d372f SHA-256: e94f54dca8eb79a0faefa5401b0f1e5eecc64e6ede5639eaf4d6f35b8fb0e2dd
186 Risk Score

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. 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 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 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.
  • 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://lozipotod.ru/strik?utm_term=what+is+a+dog+called+in+spanish PDF link annotation
    • https://cdn.sqhk.co/fudikuzi/6wL0d0H/pisoxenekijejemedu.pdfIn PDF document text
    • https://cdn.sqhk.co/fogunivugame/LhdUgiZ/python_interview_questions_and_answers.pdfIn PDF document text
    • https://xorapuwo.weebly.com/uploads/1/3/0/8/130873927/debediki.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/how_to_study_sanskrit_class_9.pdfIn PDF document text
    • http://merotudonor.mypressonline.com/41461835795.pdfIn PDF document text
    • https://ganunosor.weebly.com/uploads/1/3/0/8/130814229/813d7d875ee680.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417039/normal_5fcd8fcfec546.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/igcwwep/kazamufovukinasime.pdfIn PDF document text
    • https://kuxoredekudo.weebly.com/uploads/1/3/4/3/134368385/tatopalipomepid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404488/normal_5fea43113517d.pdfIn PDF document text
    • http://xilatotes.sportsontheweb.net/biology_quiz_questions_with_answers.pdfIn PDF document text
    • https://fadefufogu.weebly.com/uploads/1/3/5/9/135960472/wukatasomozasa.pdfIn PDF document text
    • https://cdn.sqhk.co/kenixidoxexi/igghtTc/47197809916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423155/normal_601b508fae187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418777/normal_606779c15a47a.pdfIn PDF document text
    • https://cdn.sqhk.co/rafopaluko/jiiMUi7/snapchat_stock_price_chart.pdfIn PDF document text
    • https://dojenamolusojow.weebly.com/uploads/1/3/4/8/134868247/c278d6c267cc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369645/normal_5fe534ff7876e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_45bc861742ad430c8572e977dba1835f.pdf?index=trueIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_46d5e1106f004e719470bb0659a2c2de.pdf?index=trueIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_6915c0a02f3e4f15a8d31d77e0572816.pdf?index=trueIn PDF document text
    • https://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_33290796721d4528be6ea766242a41fb.pdf?index=trueIn PDF document text
    • https://869e45c2-9c2d-410b-ad52-4d3411d41339.filesusr.com/ugd/73bd41_b7f9a20b6e4b4b629975eb368baec148.pdf?index=trueIn PDF document text
    • https://f270a619-8d23-4dc9-95fa-a4320df4b75e.filesusr.com/ugd/7bd364_f0281e7a4189462895fb4b0134d1cf79.pdf?index=trueIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_206d04fcce3047898e7567d0e5affeab.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_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 5252 bytes
SHA-256: b5513b40e502f338a1a3971b373bb359868fc3ff6e7ab3019293fd5a11709387
font_01_sfnt_off000113de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DE 10832 bytes
SHA-256: d7549090f69dd8ae95b8399deed5a2fd9adc193e8785065865f4f8e591286de3