Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c21ff83ba3c262…

MALICIOUS

PDF

69.1 KB Created: 2021-06-01 17:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 035aac77f3d82d9cb53a62334a74d221 SHA-1: 70e2596f985617bc2ffca07f9e539cff2548c1ee SHA-256: 20c21ff83ba3c26258850a4eaeb8d3b1ea7acd6ff81d0df95f7d54c6ab8a1a47
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms and phishing lures. Heuristics indicate a link farm on disposable hosting, with one URL pointing to a potential phishing site. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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://inwebjor.ru/pbw?utm_term=monthly+budget+planner+excel+format PDF link annotation
    • https://volamajujidek.weebly.com/uploads/1/3/4/6/134667755/bukisumijigibabesov.pdfIn PDF document text
    • https://limumowitizuwag.weebly.com/uploads/1/3/4/5/134587832/779a96.pdfIn PDF document text
    • https://lerinaxupol.weebly.com/uploads/1/3/4/6/134662503/67c2306a.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/e19755ed-dc5d-4a34-9165-eb2894950616/kulavotixosinapazatokol.pdfIn PDF document text
    • http://garigor.pbworks.com/f/libro_sep_espaol_6_grado.pdfIn PDF document text
    • http://pupowivala.pbworks.com/f/bedejezezukaxigusapija.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/f/42232834757.pdfIn PDF document text
    • http://risoxef.pbworks.com/f/nenixizasawolepumun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb94678-eb59-4ca4-affd-ae7cc0e9c3de/93318661495.pdfIn PDF document text
    • http://mukonisu.pbworks.com/w/file/fetch/144449775/polytune_2_vs_boss_tu-3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed33624-b553-4b51-be4d-eb70921f2a12/73643914761.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144428457/junqueira_e_carneiro_histologia_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba9a59e0-3bd5-4b2a-9a37-3adde4964f68/introduction_to_embedded_systems_russell_download.pdfIn PDF document text
    • http://magogopowo.pbworks.com/w/file/fetch/144460356/gedajaveguwitatalasadi.pdfIn PDF document text
    • http://mikabipi.pbworks.com/w/file/fetch/144432633/94739543828.pdfIn PDF document text
    • http://garigor.pbworks.com/f/nescafe_dolce_gusto_descaler_nz.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_off0000d09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09F 5704 bytes
SHA-256: f05507520d736a93916770c0a6e19732a6acf17b913daddd4f4b4c6e163d0d38
font_01_sfnt_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 10444 bytes
SHA-256: 83a612c9a75027366159e708b546d175fcbc5caad87ea06c6d96c05df2894fb6

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