Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9906336f21e2bf…

MALICIOUS

PDF

76.6 KB Created: 2021-02-28 06:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1e069853cd88d24b02246d323a156924 SHA-1: 08549a282d3a1c0c1e9eba3ba0438670941cdda7 SHA-256: cb9906336f21e2bf1e4c6c0c8c5fd38837d4b0469de2ce0378d9a4174a3825dd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to 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://gimoguvi.ru/award?keyword=what+does+person+before+the+law+means PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386076/normal_60362f45b9ba8.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/eijgihB/best_designed_knife_sharpener_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459062/normal_60300e89cf182.pdfIn PDF document text
    • https://cdn.sqhk.co/roratumopiv/xDgeDgm/ginivevamanimufe.pdfIn PDF document text
    • http://rovexomakegan.22web.org/sheetz_mac_and_cheese_bites_review.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/gh8T3Mh/46373564604.pdfIn PDF document text
    • http://naturagrush.space/gexewolozogoxogal1t9s5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495684/normal_6017c1028a87c.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/xerarozopavegojukiba.pdfIn PDF document text
    • http://storeplus.pro/arabic_alphabet_in_different_formsf1uc4.pdfIn PDF document text
    • http://trellos.fun/merriam_webster_dictionary_file153cn.pdfIn PDF document text
    • http://jotijitod.66ghz.com/fexepavesowelaragili.pdfIn PDF document text
    • http://verifybadgesbusiness.com/76686851715gs4l7.pdfIn PDF document text
    • https://cdn.sqhk.co/fepexeguma/cheFKRM/46472809897.pdfIn PDF document text
    • http://floradoma.net/ingenuity_bouncer_seat_coverhvpxz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tubuzezaw.rf.gd/luwafinujeba.pdfIn PDF document text
    • http://kileduf.epizy.com/biomedical_engineering_degree_sheet_ou.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_off0000ee4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4D 5524 bytes
SHA-256: 6f69e761522931a203dbab823ae5617e76f04147bb4e61e5353778346e81f6de
font_01_sfnt_off000100ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FF 10572 bytes
SHA-256: a77c19178356535889bcf862747ef77ecfa9394885fcb4c479b442ef7610e75c

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