Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c0a52ab034bf63…

MALICIOUS

PDF

67.7 KB Created: 2020-12-18 11:48:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2b3ebac6b7cb835d89e378c8f26eb3d5 SHA-1: ba92a37991fe5e112e4e15b593fa8605310830d3 SHA-256: a3c0a52ab034bf634638bad6ece468d32bb00e7be8f0606162798b584361e3a0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffine.ru/strik?utm_term=gate+city+funeral+home+obituaries PDF link annotation
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/xaped.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386087/normal_5fafde08b90d7.pdfIn PDF document text
    • https://runigofotizete.weebly.com/uploads/1/3/4/4/134433234/5821627.pdfIn PDF document text
    • https://mutuvedaluvop.weebly.com/uploads/1/3/1/8/131856278/tedutaxulukasuz_pekonerisarunum_mikevogoliranan_jutopadomumako.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501356/normal_5fc9d8dee878c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446914/normal_5fb36a60c49a5.pdfIn PDF document text
    • https://gidavazowas.weebly.com/uploads/1/3/4/8/134863559/7063472.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/a74870bf-407d-4261-9e1b-70b29b92d76d/roblox_free_robux_with_accounts_and_passwords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b2da0b9-1809-432c-928a-5594fcf3215b/casos_practicos_de_comunicacion_orga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb8a1b3-da4e-4b18-a5bd-6e864c69647f/3417179670.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a25060f2895dc1f2fade/t/5fc551b9e6d49a06bb4339bd/1606767035633/lawimajutusikunevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/328c82e5-93b5-4f48-820f-9c5745343e75/57646671810.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_off0000ce7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7C 5396 bytes
SHA-256: 3bd42ed7e6694ab50f1a6cba041f034a1f92460bf09a73ad7cbb720b04f017b5
font_01_sfnt_off0000e0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 9816 bytes
SHA-256: 6a782d2bdd533f65c6df6e0225f1507c3011be08f257e709204792254546e417