Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c1b295066cbba2…

MALICIOUS

PDF

73.1 KB Created: 2021-03-10 06:56:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9a62cd2da2e0a36c3e13e3ea754f269a SHA-1: b1c7d9b730b4066e0bb3a1596e3b5a6baf9163bb SHA-256: c1c1b295066cbba2dfcda55264a6d6ebc463dd950c57b3f8a9afe2f27547ec89
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL pointing to zajinet.ru. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and heuristics strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://zajinet.ru/award?keyword=logical+reasoning+puzzles+with+solutions+pdf PDF link annotation
    • https://cdn.sqhk.co/bapisolel/Jhejegj/gekejizolatomepesisu.pdfIn PDF document text
    • https://cdn.sqhk.co/lidojuxuxiro/PugchcP/wijol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422392/normal_5fc5a1e536419.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxugaveg/gihbibR/3613063984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_60248e9f479a0.pdfIn PDF document text
    • http://doordash.fun/nascla_contractors_guide_booky7ahx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380214/normal_5ff0f81028474.pdfIn PDF document text
    • https://cdn.sqhk.co/pasezateda/jEhenhi/ice_cream_sandwich_cake_recipes_easy.pdfIn PDF document text
    • http://flowerport.shop/vanotupajanixilelujcxxjd.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/19e05e97-dbea-44b7-b3cd-ba4b5ba009b6/worksheet_classification_of_matter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a93a1c-20b5-4bb0-b137-e1547cd6954c/videwidafesawexajamez.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/35978272550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04da3718-6535-4f95-8132-03588fa26176/twilight_movie_free_download_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c56fd747-c6c0-480f-9330-ab9900ad1398/most_popular_behavioral_interview_questions_and_answers.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_d73d26e345b14f64a9e6fe72158b73a5.pdf?index=trueIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_32d921bb17d24f5b9fd1e24606a3367b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fovezewi/diabetes_type_2_diet_guidelines.pdfIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_b9455632e7f343e2a712a963ab157749.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_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 5500 bytes
SHA-256: 65d791f8e39ed54c0b40873570d9751175689022b02148f62558493015536dde
font_01_sfnt_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 10304 bytes
SHA-256: 77dd9bf0d7d9986a5b743b51b65b61f1bf0ead80acc37467e9af3ac6b3164c95

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