Malicious PDF — malware analysis report

Static analysis result for SHA-256 103afb02fd59878a…

MALICIOUS

PDF

67.9 KB Created: 2020-11-10 09:47:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e29f9967de44558566ceca7d94e91b2a SHA-1: d08a3502ca8ca26d06daf903751ad2feadfef559 SHA-256: 103afb02fd59878ae20739d189bb83e463bc6a0b0859d5ad8728f0165e4a5f93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the structure and numerous external URLs suggest the document is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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/strik?keyword=on+fire+letters PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393486/normal_5f9eb2e226a14.pdfIn PDF document text
    • https://jenodefutufute.weebly.com/uploads/1/3/4/3/134373351/lafagerajiratozasa.pdfIn PDF document text
    • https://fimetopim.weebly.com/uploads/1/3/4/3/134399480/gogamub-nujule-gigesawa.pdfIn PDF document text
    • https://gavawujag.weebly.com/uploads/1/3/4/3/134370084/makemuwowuledis.pdfIn PDF document text
    • https://vodoxakitukep.weebly.com/uploads/1/3/4/3/134335140/caffb5cbbf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_5fa6e85ae8b85.pdfIn PDF document text
    • https://vogizezadu.weebly.com/uploads/1/3/0/8/130814341/73fac736501.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b506798-31ce-4b7f-a1c6-38a2cc259f9b/xebifanumolipojake.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/gym_candy_book_essay_recommendation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3910d67f-13f9-41db-a777-91a63acb380a/vekevawovokikeku.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_off0000cd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6A 4580 bytes
SHA-256: ed418eed7c6a7b7f5100e84641360b2bc0c2778727042a08cc3b434148a88078
font_01_sfnt_off0000dd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0D 11348 bytes
SHA-256: 5afdba6538f19edb5d4a1cd50bc11784ac83d8a767f37947c320f3070af9f312

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