Malicious PDF — malware analysis report

Static analysis result for SHA-256 50cda2e9a4843b59…

MALICIOUS

PDF

74.5 KB Created: 2021-03-22 22:12:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 206c555cd6e79868c71e05f9e5b57b65 SHA-1: a80e04c446ff6b422342a86f332830ad399724e4 SHA-256: 50cda2e9a4843b59ded51882354490b8835afe51d3c9765697c31fded5e1bb1f
166 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains multiple external URLs, one of which is a redirector with a 'utm_term' parameter, suggesting a campaign. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted, but the presence of embedded URLs and the overall structure point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://xezojetit.ru/strik?utm_term=how+to+use+fabric+softener+in+lg+top+load+washing+machine PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369174/normal_6051e1169d45c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493266/normal_5fcd8991e195c.pdfIn PDF document text
    • http://alania365.ru/lewis_structure_for_bbr362cl7.pdfIn PDF document text
    • http://flipping-car.online/89642452135406s7.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/fghbjcp/35322635108.pdfIn PDF document text
    • http://zewenidasi.iblogger.org/ancient_history_books_free.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/31874221754.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/dvUghja/yellow_lightning_transparent_background.pdfIn PDF document text
    • http://rusherx.studio/wamargit6p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428331/normal_601002a10e8df.pdfIn PDF document text
    • http://ruszaimclub.ru/1795461213qhk97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_f10c9c3ef20f43bca0445291a7b09507.pdf?index=trueIn PDF document text
    • http://tesekinapoden.epizy.com/32743811526.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_c8353e59c45e47999741425a3a584905.pdf?index=trueIn PDF document text
    • http://zorarovotasutot.rf.gd/what_does_it_mean_to_have_clean_hands_and_a_pure_heart.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_98544d6b36c043c7a555f62795e8544b.pdf?index=trueIn PDF document text
    • http://nibejodawugizex.rf.gd/how_to_clear_codes_on_kenmore_washer.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_f2cff7035da44588befad021f1ea8271.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_off0000e473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 5760 bytes
SHA-256: 77de02a98cc3aa7e7e1643576c629c7976da9890d146fb543b20c7723a50c37e
font_01_sfnt_off0000f7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F0 10796 bytes
SHA-256: f6c53cd2e6cbb7eca06760742e9e07aab2c2ba0f656783594b98c4c0e1cc6e44

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