Malicious PDF — malware analysis report

Static analysis result for SHA-256 816083d79d3ecc72…

MALICIOUS

PDF

67.9 KB Created: 2021-01-05 23:48:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: af663f678c007a7f13f52f87f1feed77 SHA-1: 2ad096dc440847edc73227425e1b8ebd4f952cc5 SHA-256: 816083d79d3ecc7255f4ba338d5df9d2b51aadbe7961747bf6ca11ab074fd2fe
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The primary URL, 'https://traffnew.ru/123?utm_term=us+history+themes+gcu', is likely part of this malicious infrastructure.

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
  • 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://traffnew.ru/123?utm_term=us+history+themes+gcu PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5fa9a9fd31283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489722/normal_5fd205a33b57a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419425/normal_5fa5534844f40.pdfIn PDF document text
    • https://sunuxima.weebly.com/uploads/1/3/5/3/135324667/fexuw-pabosele-vilotisafiful-lejonu.pdfIn PDF document text
    • https://vibufimibe.weebly.com/uploads/1/3/0/7/130738819/jozoramako_joxezulanezofom_zuwokotomugez_rinomewe.pdfIn PDF document text
    • https://tulixepatezapik.weebly.com/uploads/1/3/4/9/134902644/xazozunobases.pdfIn PDF document text
    • https://cdn.sqhk.co/jevikepuja/ubjg4zh/47404132493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_5fa0993a89e85.pdfIn PDF document text
    • https://bosubunu.weebly.com/uploads/1/3/4/6/134693877/95e0c9a8d8da86.pdfIn PDF document text
    • https://degezumibupupek.weebly.com/uploads/1/3/4/8/134862322/mugakanamuje_xowubufaw.pdfIn PDF document text
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/xemelomodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408588/normal_5fb5162e71694.pdfIn PDF document text
    • https://munerojepoges.weebly.com/uploads/1/3/4/0/134042508/9007768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nawuvud/kidutip.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_off0000ce94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE94 5064 bytes
SHA-256: ae9505be3a3b6f0d546eda8b7db4c228d1e3f2dd613b26bf511c7da410cee00d
font_01_sfnt_off0000dfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 10416 bytes
SHA-256: c7227b5b189d8a47562bb500d01e498976e443c9acd5d85dda849e64b92a282f

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