Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a96a364b4cc82f0…

MALICIOUS

PDF

71.7 KB Created: 2020-12-17 18:35:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ac762c0915b5fae53e75953ea0229f7e SHA-1: c0e1d00ed1dfec7f24f90dd6e198e88ba08d328a SHA-256: 8a96a364b4cc82f096714fc78237c3735235f1260f136495fee09f97577e5a62
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://trafffe.ru/strik?utm_term=swelling+after+spay+surgery PDF link annotation
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/zanazanekoxel.pdfIn PDF document text
    • https://jujijojof.weebly.com/uploads/1/3/4/3/134353579/d647e684d96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388289/normal_5fdb2ad5e3ddc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f8c4dc4664a4.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/kakegibefokow.pdfIn PDF document text
    • https://lugiwitowux.weebly.com/uploads/1/3/4/6/134679166/rakaf.pdfIn PDF document text
    • https://xamorodedas.weebly.com/uploads/1/3/4/7/134714841/xuribananitoburitu.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/4d16b42d0d090eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496204/normal_5faeef31b65b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422918/normal_5fb6e6f7a5808.pdfIn PDF document text
    • https://mibelilav.weebly.com/uploads/1/3/4/7/134747519/03cac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc56006abaecd3318401c97/t/5fd729da9264095525ed49bd/1607936477239/4293212642.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/storyline_3_free.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_off0000dc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 5364 bytes
SHA-256: a85fc59d909f3dc0cdcba13bc3dacfad70a77b3ca67f81125efc28415e76d781
font_01_sfnt_off0000eeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 10384 bytes
SHA-256: a4b868d78e10f358bbe73a8b35e48d224d9ddf1a94533fa517f2e3b9f33eaede