Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1b847c15e55325…

MALICIOUS

PDF

94.9 KB Created: 2021-03-14 06:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e92a748f4bcf0b428ae80f1eca51f081 SHA-1: f8833911a897af3ae0d32bf58b5553f34eef8743 SHA-256: 3c1b847c15e5532581ac1cf7b13d87501b51e14f2b542d242b26b195cfab6f9d
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. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The primary URL identified, https://kuzutuzo.ru/strik?utm_term=sullair+compressor+manual+ls-20s, is likely a phishing lure or a gateway to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kuzutuzo.ru/strik?utm_term=sullair+compressor+manual+ls-20s PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384851/normal_60181ad1a6518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406463/normal_600be9319ec10.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/57583170187.pdfIn PDF document text
    • http://xezixaz.getenjoyment.net/vowezokevedorexamu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451575/normal_5fca344ec0d14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b3527780-875a-44fa-b0f0-ade990bdd1e5/87578346954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/922fdc1d-fdb6-4a28-a79f-a282f9c5d979/86918024636.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/expediting_expenses_report.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/character_arc_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/977d989a-33f8-4623-8533-031bb5ddec78/xoruwibuxitidabanali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aaa3b1a-ca77-4987-8575-bd6dc84653a8/jixigagovozekagixato.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/ads_aircraft_design_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc5bf9cb-78b9-4271-9a57-101ceb11838f/64641538097.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/writing_answer_sheet_ielts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ac62220-1100-4624-bac5-92d377cda55d/jenewebelulifatof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5001d19d-4adb-478f-97b6-fdf781ff4704/wekagixogotodivujeg.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/doctrine_of_justification_by_faith.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a8c2483-6f14-4eb5-a291-f26f1aa0a5c2/pawaketusadefamefasominot.pdfIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_411618c1c3fb4f4ca57c75d4cc72dd88.pdf?index=trueIn PDF document text
    • https://0a9dc515-c6d9-419f-b4de-d801a8c2a39b.filesusr.com/ugd/760a4c_eb75161f7d674c03b73609bdde518e52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cfadae5-5375-42c2-a245-cd805971f772/xupapolelaku.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_67a9f250c44b47b18b801263f8635a23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisazabe/34326501387.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12629 5292 bytes
SHA-256: ecd3901cc95cdaf8e149be325522b164c00f494cc278e2d34662bcbce3b35782
font_01_sfnt_off000137fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FD 11156 bytes
SHA-256: 299fb88bc1937a44342f892bbc96072b6c369863966f99cfa493e873bb7b3fa5
font_02_sfnt_off00015def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DEF 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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