Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5b122bef9b8f06…

MALICIOUS

PDF

75.5 KB Created: 2021-05-28 09:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 484abfdb255fe09e56508e6483487ba2 SHA-1: 64b1c59279ae3d48c9410399e0289e305ef97d32 SHA-256: 2d5b122bef9b8f061c948c093a7abdfb0f1022f5aad42c4fba7d55b6e10e6a16
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on link farm domains, indicating a potential SEO spam or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=how+to+choose+the+right+sewing+machine+needle
    • https://vakikuxikedeti.weebly.com/uploads/1/3/5/3/135320305/559462.pdf
    • https://cdn-cms.f-static.net/uploads/4385216/normal_605578734a525.pdf
    • https://cdn-cms.f-static.net/uploads/4413226/normal_60372c213b66e.pdf
    • https://nagorulanol.weebly.com/uploads/1/3/4/4/134465391/821a11d7699.pdf
    • https://cdn-cms.f-static.net/uploads/4460243/normal_602ec3872c7ed.pdf
    • https://static.s123-cdn-static.com/uploads/4459176/normal_5fcb4b5aa5cc6.pdf
    • https://nokatumevizo.weebly.com/uploads/1/3/2/7/132740479/1168946.pdf
    • https://fibavizenimi.weebly.com/uploads/1/3/4/4/134485548/708f5aabe2.pdf
    • https://cdn-cms.f-static.net/uploads/4379837/normal_6010c5aef2dd4.pdf
    • https://cdn-cms.f-static.net/uploads/4365570/normal_601ad3dcb5404.pdf
    • https://niboxevukok.weebly.com/uploads/1/3/4/6/134649508/kutegi-fabenafafojuzir.pdf
    • https://cdn-cms.f-static.net/uploads/4415526/normal_601b60593a264.pdf
    • https://cdn-cms.f-static.net/uploads/4499958/normal_604872f2c719d.pdf
    • https://static.s123-cdn-static.com/uploads/4481663/normal_5fe2ce350d9b1.pdf
    • https://cdn-cms.f-static.net/uploads/4447916/normal_6028fc122ea45.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6c529845-cc93-49eb-8aad-327139670df2/sims_4_pregnancy_labor_cheat_ps4.pdf
    • https://uploads.strikinglycdn.com/files/e1723451-0110-4c8d-9651-150b64178414/7370068742.pdf
    • https://uploads.strikinglycdn.com/files/fe9bee6a-a13f-4491-9270-c6b8ff943fa7/22436955317.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa6.bin
e001dd62041bc018862f4f8545c75c012aedeccb48fc08cc7ebba95906f4e6d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 5408 bytes
font_01_sfnt_off0000fceb.bin
1924866f74aee38a6b6cd964ff11f8464fe45336ea10899b16ff3b0d11098bc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEB 10668 bytes

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