Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c07c41f4fd6376…

MALICIOUS

PDF

74.9 KB Created: 2021-01-21 09:06:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8a885bb5272af3004cf56479a2057420 SHA-1: bde66fb15f6e376800969f6ffb9cc430eff6fe98 SHA-256: 39c07c41f4fd637628bab6efa6b225b96af7fd551024c0cc6fffb8c3fe059cd1
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to redirect users to malicious sites. The document body, though partially corrupted, references 'Bmw 850csi for sale', likely a lure to attract clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=bmw+850csi+for+sale PDF link annotation
    • https://site-1257619.mozfiles.com/files/1257619/vorovaxujotikuxemunop.pdfIn PDF document text
    • https://site-1175548.mozfiles.com/files/1175548/menabaxuxubufafa.pdfIn PDF document text
    • https://cdn.sqhk.co/xisalaximel/jfijXhd/motorola_flip_phones_at_walmart.pdfIn PDF document text
    • https://site-1171851.mozfiles.com/files/1171851/black_friday_2020_laptop_deals_dell.pdfIn PDF document text
    • https://cdn.sqhk.co/balapakufogo/egfBheC/harris_academy_jobs_login.pdfIn PDF document text
    • https://buparemekixa.weebly.com/uploads/1/3/0/7/130739227/losirejenemapani.pdfIn PDF document text
    • https://sunajekivogemaz.weebly.com/uploads/1/3/4/8/134895881/117d97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_5fa53ade3b762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479932/normal_5fad3cba60beb.pdfIn PDF document text
    • https://vinofuloro.weebly.com/uploads/1/3/4/8/134850824/167411b378306.pdfIn PDF document text
    • https://cdn.sqhk.co/narobalof/jPnrQjf/evil_spirits_armor.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/TFjD7id/war_of_the_worlds_1953_dailymotion.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/gd1mgc5/mr._ninja_fever.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385434/normal_5fb7e03aac9fc.pdfIn PDF document text
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/8675016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5f8973fc2754b.pdfIn PDF document text
    • https://site-1181123.mozfiles.com/files/1181123/human_resource_management_tutorial.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/rilexazejuzovep/mekifuwerenufuramevubuz.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_off0000e6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B9 5628 bytes
SHA-256: 6ad91da093608c34fbb49ab5aa763e13aa9b3741e54ae3c92b0866a17af11c13
font_01_sfnt_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 10912 bytes
SHA-256: 4658ae7a4d87e61b96c82cc4bb2ea4e51f035fdf85b5c32548f0c6a4698d217a

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