Malicious PDF — malware analysis report

Static analysis result for SHA-256 97926c2f6d1e42cd…

MALICIOUS

PDF

89.7 KB Created: 2021-03-14 07:22:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6f0b273e52176f54da18e64a3d61fecc SHA-1: 23f99dca40c7dad09026d235c3536e8ff3a8f474 SHA-256: 97926c2f6d1e42cd606c36d1bf423c4394637c0beb36569be2875d462fe09687
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit users through these external links.

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://dugedepap.ru/award?keyword=bestiario+de+arton+vol+2+pdf+download PDF link annotation
    • https://cdn.sqhk.co/podizapexiv/hKxFThb/dilimikefivumugukigagage.pdfIn PDF document text
    • https://cdn.sqhk.co/xudevekelefe/hhiRghV/stack_attack_minute_to_win_it_game_instructions.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/sat_practice_test_7_answer_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/icujjKT/71713035744.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/af5ojb9/bollywood_ringtone_2020_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/vHgjhM6/bubble_popper_abcya.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_c8a73cef69ca41e19212616a44c34c17.pdf?index=trueIn PDF document text
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_52cdf38e54bd41d9aafe763ea976b59d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/028a5f43-9595-4c3d-a4d8-446de863aa92/manual_de_quimica_organica_e_inorganica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e43dee9a-2eb8-46c2-9a99-94a2c588143e/kigarixazonoxawiliwiwofub.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/nufewexejaxidowosoruna.pdfIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_6f5326ff18ec48918a79655445b45a41.pdf?index=trueIn PDF document text
    • http://pekiluji.atwebpages.com/common_core_algebra_1.pdfIn PDF document text
    • http://pekamidakoj.atwebpages.com/63427508889.pdfIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_ea9705c6de644c59b061944103d147be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suximawo/5929713899.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/83758756535.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_off00011b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8C 5368 bytes
SHA-256: bf95c8669d750c626367d5d3e8eee9e41e4f4af57d76b1930e13bca5378186ba
font_01_sfnt_off00012df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF8 13908 bytes
SHA-256: 37c6a6b4d80cbf5e1c093b901d0c2997cbd9457425d2b78668f22cfe95d2c5d9

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