Malicious PDF — malware analysis report

Static analysis result for SHA-256 508f3fd09a0a7326…

MALICIOUS

PDF

85.6 KB Created: 2021-04-07 00:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2673202613fabf5915875c96dfbe69b7 SHA-1: 6e1ad58fac32315a7b5464464541c9d5da0f5906 SHA-256: 508f3fd09a0a7326619746184bc12bf1843430d297ce24465ce1df10219d1781
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/strik?utm_term=how+to+do+conditional+probability+in+python
    • https://static.s123-cdn-static.com/uploads/4390366/normal_5fe243da36608.pdf
    • https://cdn-cms.f-static.net/uploads/4502248/normal_6063363a08a58.pdf
    • https://cdn-cms.f-static.net/uploads/4385437/normal_6019cf61326be.pdf
    • https://static.s123-cdn-static.com/uploads/4393908/normal_5fcb9935ce7e6.pdf
    • https://wopuxikejixup.weebly.com/uploads/1/3/1/8/131856699/1db2b9e6721a.pdf
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/vebodufido.pdf
    • https://joxoxego.weebly.com/uploads/1/3/4/6/134664344/13dde60.pdf
    • https://cdn-cms.f-static.net/uploads/4422879/normal_5fe6881e42223.pdf
    • https://jazediwugitali.weebly.com/uploads/1/3/4/7/134730671/8191589.pdf
    • https://static.s123-cdn-static.com/uploads/4414864/normal_5ff4d1082eac6.pdf
    • https://dorixakogika.weebly.com/uploads/1/3/6/0/136051108/66d68ba.pdf
    • https://cdn-cms.f-static.net/uploads/4466151/normal_60653c3fac8c2.pdf
    • https://cdn-cms.f-static.net/uploads/4462059/normal_6035004b36f28.pdf
    • https://ligavovifoma.weebly.com/uploads/1/3/4/5/134522072/bapusenomupak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_d8657c97a8d1413cbd56ee456e0c8dd1.pdf?index=true
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_15c77ca7e8104f08b57e5045f49fc847.pdf?index=true
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_e821b5df8dbb460abea66958457a784d.pdf?index=true
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_6e375ca851f2426da2eabdac95cfab83.pdf?index=true
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_9e02e808dc1c4f64ae0aa7ac047d4793.pdf?index=true
    • https://6558ac43-984d-4e3a-97a1-dec8860611ed.filesusr.com/ugd/c73740_b47c30b323f945b783e6761c00614960.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ee5.bin
b057f1c3e462f5b0e43940b927f359928479073b71a3cc2d37ba92c68c6f9e5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE5 5280 bytes
font_01_sfnt_off000120dd.bin
2affaa17013148d9c94e901e70c44ee892e0bfa9084ddfca80a03ecbf2d9c33a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120DD 11904 bytes

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