Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f0fd8a1d05b685…

MALICIOUS

PDF

83.6 KB Created: 2021-03-12 05:30:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 045a3dda49499163176f0e75a02de91e SHA-1: a7f7b7f70321b13a4bba27223b3bf975cc3c1f79 SHA-256: d9f0fd8a1d05b68589265d97b47d2100e06580d5581addc2aeaadac8af928dfa
156 Risk Score

Malware Insights

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

This PDF file contains numerous external links, forming a link farm, and is detected as malicious by ClamAV and an ML classifier. The primary URL, 'https://zajinet.ru/award?keyword=allotropes+of+carbon+pdf+download', suggests a lure to download a PDF related to 'allotropes of carbon', likely a phishing or malware distribution tactic. No scripts were extracted, but the extensive link farm indicates a strong intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://zajinet.ru/award?keyword=allotropes+of+carbon+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369638/normal_601e4278ef1a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493600/normal_5fe0ff1078f81.pdfIn PDF document text
    • https://lipofodimeduwep.weebly.com/uploads/1/3/0/8/130813747/rujago.pdfIn PDF document text
    • https://tisolalaw.weebly.com/uploads/1/3/0/8/130814234/gisaxax_zizinotabofe_fivuka.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/fanudobuji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458163/normal_600203f0bf850.pdfIn PDF document text
    • https://relazubaw.weebly.com/uploads/1/3/5/3/135315829/jisaru-nagigo-pezuteru-mejevujuxume.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505363/normal_60004b67329ef.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/a05f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402252/normal_5fceb1d3c6b92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450430/normal_601f7e6093d9f.pdfIn PDF document text
    • https://tiwoboromezusud.weebly.com/uploads/1/3/0/8/130874009/2d250ee0319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411231/normal_5fd652c016802.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424682/normal_5fd058d652af2.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/01c62d4b-9dee-4095-9ead-873543cc928e/timex_mens_expedition_field_chronograph_watch_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a29853e-e5ab-4dd3-81f2-7e3ccf4ca281/physics_lab_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/4976152393.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/gokewugiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37697b26-7122-4014-bf96-8f8105951ef1/29624338185.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_off00010522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10522 5372 bytes
SHA-256: 46b99b0e0814702cd08481681fd2de892c36a43fe930c69344b80762ec7db0b8
font_01_sfnt_off00011781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11781 12532 bytes
SHA-256: bd75bab0286e137d95d35815fe913505f3e7917bb3218c6b4de9a97f17dc1ee3

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