Malicious PDF — malware analysis report

Static analysis result for SHA-256 be872c0777ecd9bb…

MALICIOUS

PDF

91.7 KB Created: 2021-05-22 08:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8b894400c41be57fc52429ded91accb7 SHA-1: 3c93d3414ead85511950103bfdf552e69722f2eb SHA-256: be872c0777ecd9bbd225466a4df5672fa3098eeee137a8980bc46d85bf26490b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDFs, suggesting a link farm or SEO poisoning attempt. One prominent URL, https://mezovuduw.ru/strik?utm_term=the+ar-15+complete+owner%2527s+guide+pdf, is flagged as suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 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.
  • 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://mezovuduw.ru/strik?utm_term=the+ar-15+complete+owner%2527s+guide+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450507/normal_601dbb291d826.pdfIn PDF document text
    • https://vobulesije.weebly.com/uploads/1/3/1/8/131857334/sozixirugibe_katofobumeribaj_zowonu.pdfIn PDF document text
    • https://bedapidipofawif.weebly.com/uploads/1/3/2/7/132711979/zisubizamu_napizuxubex_lajoretumom_vaketetefagumo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466675/normal_60522b3d0f5a9.pdfIn PDF document text
    • https://tufojeju.weebly.com/uploads/1/3/0/7/130740258/3363864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_5fd68e8fa3bbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477369/normal_6057e00a2b50e.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/pujirageg/jorofakisiwifuj.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/xowotorev.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/sazomasilemix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d72e9fb-fa9a-422a-b1c2-9327618f4de8/what_cvs_pharmacies_are_doing_covid-19_testing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/838b4bfb-4140-4706-ae1b-15a964d56512/install_printer_brother_mfc-j5910dw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afbaf3f4-c8ad-4155-a632-8575cee83bb3/play_the_long_game_expression_meanings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dee6309-9d78-4a1b-8afb-3cffa7a36682/15161130146.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/monthly_retirement_planning_worksheet_chapter_8_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/poetry_styles_for_elementary_students.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/software_tester_salary_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc2ffab6-93f4-437f-b89d-e110edb04057/insinkerator_hot_water_tap_only.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/48240588278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68556d8b-263a-4af9-ac53-94a8ccf8cc14/18578012941.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_off00012759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12759 5852 bytes
SHA-256: 721b4a0e95ac1e7145868bb505f8bb0260eac93c79fe9f81972c0d746963c984
font_01_sfnt_off00013b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B42 11276 bytes
SHA-256: bc2324c03115508d6771b2157e2dc892aeac9199ecae35acdaf3059a1102daaa

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