Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd26bf52eb93a9e5…

MALICIOUS

PDF

77.8 KB Created: 2021-05-08 11:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8be83a9938c1d274de60dc56409a751d SHA-1: 2cd0a94ef2ea815b3ddae5e1366a0579ff27142d SHA-256: cd26bf52eb93a9e507b44af6f91b038fa469841d8734669ef90f1eb9a854355a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a redirector link and a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs point to suspicious domains, including 'yafferge.ru' and 'poposiruta.mywebcommunity.org', which are likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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 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.
  • 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://yafferge.ru/strik?utm_term=font+for+dummies+logo+gaming
    • http://poposiruta.mywebcommunity.org/tuzuvakemezideruxepep.pdf
    • https://static.s123-cdn-static.com/uploads/4454803/normal_5fe55d266c7df.pdf
    • https://cdn.sqhk.co/ruwopazeg/gdjfjcp/baby_pic_hd_image.pdf
    • http://wupunekum.getenjoyment.net/pezapumewirinomo.pdf
    • https://cdn.sqhk.co/tinipuded/DjgAhhb/95240711675.pdf
    • https://cdn-cms.f-static.net/uploads/4457881/normal_60222a310e468.pdf
    • https://cdn.sqhk.co/mudogaxi/QlAjhNt/lonijaxutadumumo.pdf
    • https://cdn-cms.f-static.net/uploads/4445742/normal_60303fc60f982.pdf
    • https://static.s123-cdn-static.com/uploads/4403938/normal_5ffe988fc27e2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cbe6130c-3c26-446d-bdc8-574f7bdf9ad6/a_gas_in_a_piston-cylinder_assembly_undergoes_a_compression_process_for_which_the_relation.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/can_learners_permit_have_passengers.pdf
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_90eee866390a4856b2af71292e0ddf9a.pdf?index=true
    • https://s3.amazonaws.com/tadevewuju/solvency_ii_balance_sheet_diagram.pdf
    • http://nabafutig.myartsonline.com/hiit_workouts_for_beginners_at_home.pdf
    • https://uploads.strikinglycdn.com/files/02cb1911-5356-4b1c-97f3-1c546cf5a35a/what_does_it_mean_application_in_review_processed_yet.pdf
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_f20972d0913b46c78a8fe111fa29c6ab.pdf?index=true
    • http://ratobewiwigu.atwebpages.com/pallet_adirondack_chair_plans.pdf
    • https://s3.amazonaws.com/sitozi/66832973620.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_off0000f0cd.bin
f748a6efd197983ec6b647bf2f16bb5abc51a23b6b8a35eafd7458bf02126b97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 5184 bytes
font_01_sfnt_off0001025c.bin
8cc57c368a5a4b108cba3c3a0c3a4e4d1af119afdc6d5a39209f4c5fdbdc80ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 11764 bytes

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