Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a5d4cf0e3bb03a…

MALICIOUS

PDF

85.9 KB Created: 2021-03-15 18:42:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1901a73c187010d6db8f87f6a409afa8 SHA-1: 2681d5d64dd49f208364db1fd8f4f43910800167 SHA-256: 85a5d4cf0e3bb03a51c18921c52dbb64ea64b02833abcfc7236201a7260618bb
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata related to PDF generation, and the presence of embedded URLs further supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/award?keyword=agarose+and+polyacrylamide+gel+electrophoresis+pdf PDF link annotation
    • https://widonudafedezu.weebly.com/uploads/1/3/0/7/130776490/peduduwaxu_dimowo_noxanilumukozo.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/vavukanidowoner.pdfIn PDF document text
    • https://pamezupiv.weebly.com/uploads/1/3/0/7/130775156/pinoja-xodanexogijib.pdfIn PDF document text
    • https://nebenumepidenok.weebly.com/uploads/1/3/5/3/135307723/lubekof.pdfIn PDF document text
    • https://webunufilijamo.weebly.com/uploads/1/3/4/6/134677486/401d39eb0b38d6.pdfIn PDF document text
    • https://jugoneworo.weebly.com/uploads/1/3/4/3/134307205/84989.pdfIn PDF document text
    • http://kijewumiw.iblogger.org/86300109209.pdfIn PDF document text
    • http://kirererusuk.iblogger.org/tikanefububadatabogi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_e100661c73284a38bc9f8a384cca37c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/how_to_say_answer_questions_in_spanish.pdfIn PDF document text
    • http://vizepojuduw.rf.gd/spreadsheet_for_tracking_income_and_expenses.pdfIn PDF document text
    • https://fefcf4f0-bf52-4086-adb3-b788df03f7bd.filesusr.com/ugd/da9d4c_f3ae5fba0cf54f479bc389b5ff261102.pdf?index=trueIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_fc8ca097178d4ce2a7b85b028f82aab0.pdf?index=trueIn PDF document text
    • http://gonekiwefed.epizy.com/guginikisuki.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_f15a43a68b994a81ae8850a1639faf4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/vabusodomowakoluxuliwu.pdfIn PDF document text
    • http://fiwabafedazuv.epizy.com/igloo_retro_mini_fridge_3.2.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_off0001111b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111B 5660 bytes
SHA-256: ef1af735deea8d79ea2cd911ec2d11bd9a4fb53fe92e29ff75c7a4fe0e760f1f
font_01_sfnt_off0001243f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243F 11224 bytes
SHA-256: 8c1cf9e137b681fd039d035c725cd6b38ef3217c03ec20ce54a5cd9286eef543

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