Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e542bdb436457d…

MALICIOUS

PDF

74.8 KB Created: 2021-03-17 09:50:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0ffa1afb7d00e55ca87e928c885fbf94 SHA-1: a43e13eb86a81542d21f2827b59f6b6347bea975 SHA-256: 84e542bdb436457da1aa1ffdec1bd5c02b274414d220ed9b1e2c56d165114aad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/wix?keyword=black+and+decker+24+volt+battery+walmart PDF link annotation
    • http://namedaun.fun/xedimuxakopedos6tu7t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498345/normal_6013359388881.pdfIn PDF document text
    • http://arm-watch3.club/5666911206435v1w.pdfIn PDF document text
    • http://vilopeg.xyz/tewetalavutedawafajufi98ha.pdfIn PDF document text
    • http://xukuvapama.iblogger.org/13148470636.pdfIn PDF document text
    • https://buvurowu.weebly.com/uploads/1/3/4/6/134638295/4728150.pdfIn PDF document text
    • https://lusogovo.weebly.com/uploads/1/3/4/3/134358567/kokifix_viguvuxive.pdfIn PDF document text
    • http://mikrotikwizard.com/open_plan_kitchen_diner_family_room_ideasfla9o.pdfIn PDF document text
    • http://greatholl.com/yongnuo_yn560-tx_ii_manual_flash_controllerx0klb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368500/normal_6035c4408eb84.pdfIn PDF document text
    • http://hookup750.website/casio_ctk_7200_keyboardw32ci.pdfIn PDF document text
    • http://ledy66.net/international_sex_guide_tokyozlrap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505096/normal_6010de7b53518.pdfIn PDF document text
    • https://mofazutozu.weebly.com/uploads/1/3/4/8/134871383/78ceee4bd3d.pdfIn PDF document text
    • http://jixerusax.iblogger.org/51138394.pdfIn PDF document text
    • http://kozizukexepuf.22web.org/46419438942.pdfIn PDF document text
    • http://electriccannoz.club/nepivezogesukizovowedofrwae8.pdfIn PDF document text
    • http://gadimikofeboto.iblogger.org/small_babies_hd_images.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gogonof/notasupo.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/82475157337.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/rotuxi.pdfIn PDF document text
    • http://gesulomesazisaj.epizy.com/38639043000.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/78201031006.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_off0000e3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 5632 bytes
SHA-256: 929a27f373af38126fff5ff769444f99606a23f4f3e2db9bb1b27f884ff3f72c
font_01_sfnt_off0000f6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 11432 bytes
SHA-256: 3aac9c91cf88f0b915269645f4440b54a3a2d0877b92153533652d88a01b8d55

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