Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d2b6b6b3fe2574…

MALICIOUS

PDF

82.5 KB Created: 2021-02-27 20:40:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 624fd4e43ad5c5895ba7e53cb8b5bf51 SHA-1: c822d646ace9a545a17495ec951013bc877188e4 SHA-256: 96d2b6b6b3fe2574547e871e9b86f98c155a8c447e6c600346224fca1bf948a9
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to disposable domains, many of which are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to academic writing, suggesting a lure to attract unsuspecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://midufefew.ru/strik?utm_term=how+to+write+a+literary+analysis+essay+conclusion PDF link annotation
    • http://rumurel.mywebcommunity.org/marketing_management_15th_edition_ebook_rental.pdfIn PDF document text
    • http://retamos.mygamesonline.org/how_to_interact_with_nonverbal_autistic_child.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/gadojosotasekunimira.pdfIn PDF document text
    • https://roribevewo.weebly.com/uploads/1/3/4/5/134502196/gupifajarixi.pdfIn PDF document text
    • http://pedron.fun/remurikipinitijavob83nam.pdfIn PDF document text
    • http://fumigatoff.online/emergency_contact_medical_information_templatelmygt.pdfIn PDF document text
    • https://jowatoziji.weebly.com/uploads/1/3/4/8/134893097/xaxubike-zorixaxat.pdfIn PDF document text
    • https://xexunejakex.weebly.com/uploads/1/3/4/2/134266262/8527876.pdfIn PDF document text
    • http://hayatevesigar.online/wedetq5xt4.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/how_to_draw_an_isometric_view_by_hand.pdfIn PDF document text
    • https://cdn.sqhk.co/rokabumake/nd0ib95/circular_wood_cutting_saw_blade_discs.pdfIn PDF document text
    • https://vivusujode.weebly.com/uploads/1/3/2/6/132682813/lepufatijebuno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabenejajoko.myartsonline.com/rodaripuxujezaxasorop.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/akira_2016_full_movie_300mb.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/arizona_beneficiary_deed_form_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_off0001077e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077E 4948 bytes
SHA-256: 360c4b720dcd9a6c0efe1f569ea51b03ed69357bf72916f3c7dd9b6c3506c63d
font_01_sfnt_off00011873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 10500 bytes
SHA-256: e1095158d68b3d6099413cf088e7beab28a6ea2aa9ef56f0a28c04aea6a0f1d3

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