Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0152465875ec4ab…

MALICIOUS

PDF

71.8 KB Created: 2020-11-14 11:14:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 364a20c81fed5d7e3656d5ae3579e592 SHA-1: 53332cf548d4b2b22a63c858c78f348ad74714b0 SHA-256: a0152465875ec4ab4c23084679ad4a900060dd4f8d20a414c58ebc91d5330361
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malicious document. It contains numerous external links, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/123?utm_term=patricia+polacco+books+pdf
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/lorubavevotu.pdf
    • https://sulesebu.weebly.com/uploads/1/3/4/6/134634805/wuzem.pdf
    • https://vubumemor.weebly.com/uploads/1/3/4/0/134012760/muzoguseroges-dumodelavo-bupuwad.pdf
    • https://jurizimobijagi.weebly.com/uploads/1/3/0/8/130874317/pisofusonusuxiv.pdf
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/denebesaxademux.pdf
    • https://cdn-cms.f-static.net/uploads/4408582/normal_5f939dc4b8b63.pdf
    • https://pulisojoperun.weebly.com/uploads/1/3/4/4/134487891/rubotijesasolu_serij.pdf
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/6001dec6b5a89.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/navoburarovada/98200233309.pdf
    • https://uploads.strikinglycdn.com/files/d1b737ee-7f80-4a7b-a1a2-f69c1d2588b3/83995607166.pdf
    • https://uploads.strikinglycdn.com/files/62a98e28-13b5-4439-9d3b-3136cb49e859/34849412051.pdf
    • 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_off0000dbb8.bin
2070a2298e1989dba1e8612ab1f410e775a0ec0e9fa3cbffc70fe5f426a19551		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB8 5356 bytes
font_01_sfnt_off0000edf7.bin
ecd25d421cb9415b19eba7c6e7887a0157b93720132262caf08b60333c9967f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 10796 bytes

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