Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7bc17658eed625…

MALICIOUS

PDF

70.3 KB Created: 2020-12-09 17:44:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 54ab1fef23246816dc0e8675e1fe8c07 SHA-1: d12a151f18153520093292f454aefb2344a058fb SHA-256: 7a7bc17658eed6257e680190fd1b6355682832c20809c6883403b369ca5e991d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/123?utm_term=what+words+start+with+the+letter+k PDF link annotation
    • https://zidereromozuj.weebly.com/uploads/1/3/4/6/134602294/pawebifogumul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382620/normal_5fc6580c8562b.pdfIn PDF document text
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/fitexovop-sapafuj-sawolo-popuza.pdfIn PDF document text
    • https://pozanabuloga.weebly.com/uploads/1/3/4/3/134366917/94efc.pdfIn PDF document text
    • https://kadikodol.weebly.com/uploads/1/3/4/7/134747526/givafuratexiza.pdfIn PDF document text
    • https://kiwemedorupa.weebly.com/uploads/1/3/4/4/134446537/4316429.pdfIn PDF document text
    • https://rajerese.weebly.com/uploads/1/3/4/3/134387708/zupejobusaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382779/normal_5f8e972ce4deb.pdfIn PDF document text
    • https://mizunawakore.weebly.com/uploads/1/3/1/4/131406356/zamodiwonofurigum.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/nitizobuv/balloon_horror_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/chiranjeevi_gang_leader_movie_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/562e9ef0-f882-4d73-817e-70c95618483d/qad_ultra_rest_felt.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/online_manual_epson_2750.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_off0000d44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44D 5084 bytes
SHA-256: 3cbe02af35d540bba72765e95fd32e0263010fa82941d32f5dc83e3e971744af
font_01_sfnt_off0000e5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 12112 bytes
SHA-256: f945786e6a7e1c70af12dd745a1fcd8917c7a26b2b1fcb161c39eb86acd62eb5

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