Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e95420f9657c54a…

MALICIOUS

PDF

69.5 KB Created: 2020-11-10 09:47:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5a23c8addea14e5c66a44c5f7492c3a0 SHA-1: 649056d39b9734b35e286a0046b026eefc84cdd0 SHA-256: 7e95420f9657c54affd1314f8461ec53318c64ffee341dc051a76c33c03a52d9
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or malware distribution lure. It contains numerous links to external websites, including a known malicious redirector at 'https://traffmen.ru/123?keyword=stp+oil+filters+chart' and a link farm hosted on disposable domains. The document body, though heavily obfuscated, suggests a pretext of providing a 'chart' or 'manual'. No scripts were extracted, but the presence of numerous links points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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/123?keyword=stp+oil+filters+chart In PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/2585702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380674/normal_5f8ad2d50c2f3.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/mamuvupedopa.pdfIn PDF document text
    • https://juxupadozimufa.weebly.com/uploads/1/3/4/3/134388451/2176739.pdfIn PDF document text
    • https://gimelukisisira.weebly.com/uploads/1/3/4/0/134040832/joxevoxamebu.pdfIn PDF document text
    • https://mogawurid.weebly.com/uploads/1/3/4/0/134042680/dutasoja_jilusudowufowub.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/6f0a2c.pdfIn PDF document text
    • https://vilewufatavak.weebly.com/uploads/1/3/4/5/134585542/polikefijunenese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411246/normal_5f9aae55b26fb.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/rinozeleb.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/1eb51a39-dbdd-4107-a6c2-b3abe4f8b973/selaxafuxodetuzodepubotos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/425c6355-4ddc-46cd-9e28-603a4d3ea592/barnett_quad_400_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eda4e694-bd4d-4db7-a2b9-b7a867a73023/poe_view_profile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09068851-d6e3-444c-afe7-fed9dcea0311/68351212021.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_off0000d42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42A 5208 bytes
SHA-256: e7ecb172376a9c301ee5688c2be128b2bef01ca96dbfc286ac35695ba1e80342
font_01_sfnt_off0000e5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DD 10556 bytes
SHA-256: 7fcf2eec554affc61640afe2e997831fcd33507b275cfba7e35d4d517ee83b58

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