Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f68343e3a841366…

MALICIOUS

PDF

72.2 KB Created: 2021-05-20 10:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2b3ada2a8654c53ae892089e56d0b02c SHA-1: 24e04f7b0d2c7ea269d25cd75e6fec5af4fe6b35 SHA-256: 7f68343e3a841366850d7d1ac3dfe031c831a3d761f03ce15d48d879347c58fb
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=grammar+exercises+possessive+pronouns PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4504568/normal_603389d492340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478655/normal_602be85449972.pdfIn PDF document text
    • https://xajevopo.weebly.com/uploads/1/3/2/6/132682124/dibukun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368494/normal_60254fbf617f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447252/normal_5fe75c6d63e4b.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/jofovupetes.pdfIn PDF document text
    • https://rilulozopofebu.weebly.com/uploads/1/3/1/4/131406258/170b80fb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367650/normal_5fc80e0392fc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383921/normal_600156dbdc2d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496602/normal_5feb61d382743.pdfIn PDF document text
    • https://pinobuni.weebly.com/uploads/1/3/0/9/130969003/vuter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450733/normal_60506625f3826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487416/normal_6040d9f2a3550.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/8818894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421623/normal_6038223f7bc58.pdfIn PDF document text
    • https://jerepukiw.weebly.com/uploads/1/3/2/6/132681878/3a9b66f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472768/normal_602fc4e256577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_600a5841528dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424682/normal_5fcda2edd68d5.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/wizomoravazub/23284197143.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/94666910433.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_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 5208 bytes
SHA-256: 4c6e56944a45aad2b210fe45f975e234d2070db84f186169f753106ac963e938
font_01_sfnt_off0000ec83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC83 10964 bytes
SHA-256: d5e999d641a509ecde9cda85bde496f56b457fd0e6d239aac56f873e6dde6831

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