Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ede8c933d429a5f…

MALICIOUS

PDF

75.6 KB Created: 2021-06-02 02:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 369a1a2e261ec651e18daf3a95b93b29 SHA-1: 8032357fdfcb4a64fe7880694d28bddc9536376e SHA-256: 6ede8c933d429a5fc39e4574d245db10b300bdaae457f7f7f83de724e76d38ed
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as a link farm, containing a large number of external URLs. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the document's structure and numerous outbound links suggest an intent to redirect users to potentially malicious or phishing websites, possibly for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://laborke.ru/pbw?utm_term=left+right+center+tournament+rules PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450421/normal_5fc873efbec81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4859821/normal_6032d313bed7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_60331b9ce497a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490133/normal_6023b69838c43.pdfIn PDF document text
    • https://pixogupegitof.weebly.com/uploads/1/3/4/5/134592450/7696722e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417813/normal_604025a4512c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478961/normal_6054bb99555cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_603212b0bab01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470679/normal_5feb9fca23060.pdfIn PDF document text
    • https://xuwutofir.weebly.com/uploads/1/3/0/8/130813860/5010063.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403534/normal_5fcd3108620df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459025/normal_600986398acfa.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4481052/normal_60b1d68cd0fcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425912/normal_5ffc03abb3bf8.pdfIn PDF document text
    • https://gekofixesijivex.weebly.com/uploads/1/3/5/9/135961820/3881564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528876/normal_60491c82486a0.pdfIn PDF document text
    • https://xojozojejaxito.weebly.com/uploads/1/3/4/8/134866115/1bc3e6b9d35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://savavaze.pbworks.com/w/file/fetch/144459990/gumez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ae12b7f-efee-49a9-a782-ecf5b71400bc/how_long_to_get_prevailing_wage_determination.pdfIn PDF document text
    • http://wojipag.pbworks.com/w/file/fetch/144421173/ms_dhoni_full_movie_download_in_tamil_hd.pdfIn PDF document text
    • http://ridelox.pbworks.com/f/43280534387.pdfIn PDF document text
    • http://vifogajo.pbworks.com/f/88547472511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cfb7c14-89fd-4ab1-aaf6-cd6d46b5b84f/ronokobewitofe.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_off0000ea03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA03 5236 bytes
SHA-256: 86f28e6310ee88d339e00d2f72aa75cb06a6030ac2a7f3ee1fdb8deaba00b667
font_01_sfnt_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 10832 bytes
SHA-256: 5f01c042b760d1ade888536bd89d39bc7561a8873806d90537f20602395968cf