Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5911ed1cf670c9…

MALICIOUS

PDF

74.0 KB Created: 2021-05-06 12:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f98abc382e8d8d1c59d698a5782417f8 SHA-1: 7d89e2bbc72c69327c7e35235e3727c31c83d4f1 SHA-256: bc5911ed1cf670c9d9c7e399c18fc165258d8fa19c5c9521466eb0ba22a3e6fb
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=hp+deskjet+1512+scan
    • https://laxuwipulave.weebly.com/uploads/1/3/5/9/135956831/815d93dd4f02f.pdf
    • https://mamifamutimas.weebly.com/uploads/1/3/1/8/131871874/dorometeve.pdf
    • https://fivosegexaf.weebly.com/uploads/1/3/2/6/132683078/punesulukinil.pdf
    • https://julubagarod.weebly.com/uploads/1/3/2/6/132695517/lasasefidujanaf-wolezopen-barufisamupad.pdf
    • https://xebololu.weebly.com/uploads/1/3/4/3/134340913/2796092.pdf
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/jutevi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_dfb5265d29394e4c95640423e5aadd74.pdf?index=true
    • https://s3.amazonaws.com/vovabagubajegeb/tojuguranawikabutikofo.pdf
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_4975031abba04d259fb099ef33b4a5d1.pdf?index=true
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_85f71ef433364c698b244ee6b10bed80.pdf?index=true
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_b99680ff93f548e3ac009427eee1eb00.pdf?index=true
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_543a87195af3441d9546978ee06549c9.pdf?index=true
    • https://s3.amazonaws.com/sorogamat/atharva_veda_english_free.pdf
    • https://s3.amazonaws.com/tevomenil/gavagarosafewud.pdf
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_1b964ad3898b47f7809fb25f826d264a.pdf?index=true
    • https://s3.amazonaws.com/nademopor/65729312731.pdf
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_0f200fe8a8c14b5c87507a9e1fc176c5.pdf?index=true
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_ae349ca143ef4d0d80ff5cb999e1154a.pdf?index=true
    • https://s3.amazonaws.com/davubewu/wevubadoferogibade.pdf
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_a4851cb75334446093a6a5e8ad11aa05.pdf?index=true
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_52b4dfff447b4170a716c1b924239d2a.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_off0000e275.bin
19663120112684c7a65bab36e4655a2817e0b93f4940354a105e7c049d9ed6fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 5348 bytes
font_01_sfnt_off0000f4cf.bin
a6d09c8c4e86bc4593f1db41117bfdfd6e6d3d70641a38d6ba65496a6cecd697		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 11176 bytes

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