Malicious PDF — malware analysis report

Static analysis result for SHA-256 8905d3b35a99a61e…

MALICIOUS

PDF

76.4 KB Created: 2021-03-17 09:53:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 11bbb045d98dbe0f58ba0c4349c04630 SHA-1: b4f6cbdc2e9525de1d91ba9a7e07ce518f649d4b SHA-256: 8905d3b35a99a61e002882dc5e4d44bb5e52749188df0a9cf82cd033983541a7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://bologen.ru/wix?keyword=spray+carb+cleaner+into+air+intake PDF link annotation
    • https://cdn.sqhk.co/lepavenujal/0hehaRd/51653633921.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/ihhfhbj/xawugu.pdfIn PDF document text
    • https://cdn.sqhk.co/fexiseme/fU0I3tY/nadelopigitoj.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/aZ3Cicw/abdominal_wall_strain_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/BotMjhT/jefigelipufewubinokozavo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://viwukekev.rf.gd/tesamomunifupojidaniwo.pdfIn PDF document text
    • http://jutoxuriwiloja.epizy.com/jinevugezigabigadoroler.pdfIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_c7e8c073ba1d43aab2b3c9ef9bb2f2a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejados/1988258495.pdfIn PDF document text
    • http://batogejupimole.rf.gd/5_languages_of_love_book_quiz.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_68c7f6081b0f472da777806cf081a843.pdf?index=trueIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_77b02aa6f8664438b5ff511993636ac3.pdf?index=trueIn PDF document text
    • http://vapoborino.rf.gd/clothes_worksheets_clipart.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/53058004670.pdfIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_6a76a35c65a6425cb80f3822c4d4abd0.pdf?index=trueIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_4be094da5c084e1ebb317c5307adba67.pdf?index=trueIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_a0a48c74f33047df8df8698cf756ebd8.pdf?index=trueIn PDF document text
    • http://gafazexetoraxik.epizy.com/1897363776.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/94490971262.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_a3ca887822954b6a93a772bbe975d303.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosawef/best_mind_games_for_pc_free.pdfIn PDF document text
    • http://luzeparuzibez.rf.gd/5471678266.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/loving_and_forgiving.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_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 5160 bytes
SHA-256: 51fb9860ee5596ffea1383adebe5fb1fe9ac586b2feefea30b0b34630ebc8180
font_01_sfnt_off0000ff45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF45 10376 bytes
SHA-256: 03053e2a5e359e8d9c26a1d054e6159f48571324d47584b1d44afe03e61104aa

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