Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f2ac691eb857a2…

MALICIOUS

PDF

142.3 KB Created: 2021-04-21 05:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e73b2ce2e47493f8bad15896ac10f638 SHA-1: 1ceca77408dd87bf27147cc90ac88a888a9c8538 SHA-256: 23f2ac691eb857a2a5f22f26774476d60af8fd25fa307e91d5116b2f10ab6671
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=where+can+i+find+the+prayer+of+jabez PDF link annotation
    • https://cdn.sqhk.co/rijomawonuj/ihaS8at/brawl_stars_t_shirt_boxer.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/3ifVdaa/mujivoxibolireroruge.pdfIn PDF document text
    • http://circulshtangcalip.website/10441702683dsybd.pdfIn PDF document text
    • http://lafovawolifi.22web.org/cask_of_amontillado_poe.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://waystep.site/parallel_and_perpendicular_lines_worksheetra9jt.pdfIn PDF document text
    • http://virnet77.ru/how_to_fix_a_ps2_disc_readers29f3.pdfIn PDF document text
    • http://mattelipsticks.site/minister_license_requirements_in_arkansask2w3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_68279c92c90346ac9cb8b1364ca9a4a5.pdf?index=trueIn PDF document text
    • http://daxoperotinofo.rf.gd/34785385586.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_4d2961abaa1649c594140f98a8f7aa96.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_cab7babd13284c19b7c364aeb1b4d5fc.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_c6185398344f44c581b5fd28a90132dc.pdf?index=trueIn PDF document text
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_e44c01c18a3b41eaa7a0460c4ac4c25a.pdf?index=trueIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_3f2bbcd1f533470ab0edd81c1f953352.pdf?index=trueIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_972df6e2320940b6b063fe922e6b5988.pdf?index=trueIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_760a558700ba4c429901b72dac74f336.pdf?index=trueIn 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_off0001e250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E250 5412 bytes
SHA-256: bfc89bc6ea7c1e2b90ba1cb8838986ec6c9995a98a72e0ca55af60173a8024e1
font_01_sfnt_off0001f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F4D5 18700 bytes
SHA-256: fca221268850a7fb2aa9a63f47fa5649c6d911e79479cc9c61766617209e4c54

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