Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d898d101ea9bd9…

MALICIOUS

PDF

65.4 KB Created: 2020-12-23 05:01:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c073e338536f777502267573afa9fec6 SHA-1: 92eaba4bfd79bbb886b4b4eb28df7456aeabbc73 SHA-256: 61d898d101ea9bd9f5710a99dbfdf509aa3dbf2553bdd02600d1e95169ed1b67
214 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it functions as a redirector to known malicious infrastructure. The embedded link points to 'traffmen.ru', a known malicious domain, and the document also contains a large number of external PDF links, suggesting a link farm. While no scripts were explicitly extracted, the PDF structure and malicious links strongly suggest an attempt to redirect users to a phishing or malware-hosting site.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=enable+snap+assist+windows+10 In PDF document text
    • https://sajesugepila.weebly.com/uploads/1/3/4/4/134467456/541360.pdfIn PDF document text
    • https://riwinuwozobama.weebly.com/uploads/1/3/4/8/134868589/6365729.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/d8457.pdfIn PDF document text
    • https://tazejoga.weebly.com/uploads/1/3/1/3/131383942/9570453.pdfIn PDF document text
    • https://zozetaxurumel.weebly.com/uploads/1/3/4/5/134590082/23971d9.pdfIn PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/2420425.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2311dff9-a8b7-4508-ae9a-914694eeba5b/7414216548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c6ac783-1beb-4cbc-b2e5-f2cdfbcdd405/money_wealth_life_insurance_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd81e03-ec2c-494d-8e4d-4ac468c51faf/bebop_2_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05d4cfbb-a4b0-43e1-8cf2-ab7983674850/helias_high_school_summer_camps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/211eea2b-acd8-4b9e-9e71-ba2b59f1460c/42026070095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/751bb45c-f992-4e8b-bfc0-f33df5e4cd56/amulet_book_7_free_read.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/debe8b54-467e-4ae1-8fa8-54e1bd1c4c2a/pokemon_platinum_rom_hacks.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_off0000c4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E7 5240 bytes
SHA-256: 842c894539839dfced52d4e0d8b648044e223844bedec0eed6a1f9277b8d60f6
font_01_sfnt_off0000d6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D9 10020 bytes
SHA-256: 77674ba05535912e0468471a58b8468fe4eb572630866912e50856cb7163043e

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