Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ffa89b435f5be3a…

MALICIOUS

PDF

78.6 KB Created: 2021-05-12 08:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 11d2c293e4fb3a156972fb2a3b94fe31 SHA-1: b1e07f69c714b5d0133bbf6487727d40b1f0341e SHA-256: 1ffa89b435f5be3aaf05bb40f28db94034362fda88343fa1f02c24c43e1f717b
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 0.9998

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://gimoguvi.ru/strik?utm_term=should+i+read+the+game+of+thrones+books+reddit PDF link annotation
    • https://galesarenad.weebly.com/uploads/1/3/4/3/134380117/64162627.pdfIn PDF document text
    • https://cdn.sqhk.co/kawaniroti/fhaPhaz/akinator_full_version_apk_download.pdfIn PDF document text
    • https://rugurujumififez.weebly.com/uploads/1/3/1/3/131384765/1319432.pdfIn PDF document text
    • http://wasatosu.sportsontheweb.net/why_does_my_directv_keep_restarting.pdfIn PDF document text
    • https://julitigifoxa.weebly.com/uploads/1/3/4/3/134310533/7934380.pdfIn PDF document text
    • https://cdn.sqhk.co/soxosovave/9hgzjgV/35882679135.pdfIn PDF document text
    • https://rilokudewagozem.weebly.com/uploads/1/3/4/5/134597993/wirozetuba.pdfIn PDF document text
    • https://resagivet.weebly.com/uploads/1/3/1/3/131383325/luverarevevutab.pdfIn PDF document text
    • https://diwopoko.weebly.com/uploads/1/3/4/5/134597367/lukoregosasebuvepugo.pdfIn PDF document text
    • https://rujogapojepon.weebly.com/uploads/1/3/4/5/134597846/36bfc37087825e0.pdfIn PDF document text
    • https://leborulixa.weebly.com/uploads/1/3/4/5/134503619/bcfc46b.pdfIn PDF document text
    • https://ruxosegid.weebly.com/uploads/1/3/4/2/134265817/jusilovazudasafu.pdfIn PDF document text
    • https://vogapixafaroge.weebly.com/uploads/1/3/4/2/134234717/xiruwiwozududovela.pdfIn PDF document text
    • https://tuwagufo.weebly.com/uploads/1/3/3/9/133999840/8263236.pdfIn PDF document text
    • https://wipiwabe.weebly.com/uploads/1/3/4/4/134438476/7658047.pdfIn PDF document text
    • https://rajizoru.weebly.com/uploads/1/3/1/8/131856770/xodofa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xiwexuxe.atwebpages.com/zumasumu.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_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 5628 bytes
SHA-256: 30ad5777cb4e373350fb75ed185a2e788920552afd90f88ae6991617ce73296c
font_01_sfnt_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 10808 bytes
SHA-256: e476b42c98ae54d0a691602aae3fcebf78e208c469334dd5bf2d7f1b78007b1a

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