Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3013f00b80b678…

MALICIOUS

PDF

70.3 KB Created: 2021-01-21 22:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 233c1c1c6632a2cfdf946e91e7b101e6 SHA-1: aa024bde37e80ddc4293e74b030273bb165c47a7 SHA-256: 3a3013f00b80b6783954d1e09d19f62ba44c1cd108f20a4415cde330eab6ee22
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable.

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 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://leonvi.ru/123?utm_term=computers+are+like+old+testament+gods PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417983/normal_5ffa8c6a82a93.pdfIn PDF document text
    • https://cdn.sqhk.co/miviluwulux/OjbKrxM/stress_management_strategies_at_workplace.pdfIn PDF document text
    • https://cdn.sqhk.co/sopaluwokaja/xghhUvc/revheadz_engine_sounds_apk_para_hilesi_indir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370541/normal_6001076905eb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423728/normal_5fcc591ad6e23.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosenijosu/bigH4rZ/paint_the_cube_level_106.pdfIn PDF document text
    • https://cdn.sqhk.co/disidudi/a7Whhha/happy_wheels_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/TDxgggg/sovisovi.pdfIn PDF document text
    • https://site-1257125.mozfiles.com/files/1257125/ribalaxazigidavodosofosi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393349/normal_5fdd5d15de345.pdfIn PDF document text
    • https://site-1177116.mozfiles.com/files/1177116/aging_report_template_excel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428329/normal_5fd39c662e792.pdfIn PDF document text
    • https://site-1175077.mozfiles.com/files/1175077/garden_word_search_games.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bifamomove/basic_electrical_engineering_mcq_with_answers.pdfIn PDF document text
    • http://dogazuzi.epizy.com/mobomejuwapi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80F 5248 bytes
SHA-256: e482cfae6298c5a73cf39953fc4616f18fa0493961dbadbc0694f658a516944f
font_01_sfnt_off0000d9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CB 10900 bytes
SHA-256: ab25474aa15171e11fbc88d752c60df4c0d89fb91c3de228a71c2cfc0ff961f6
font_02_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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