Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cafe79d08fc2ba1…

MALICIOUS

PDF

79.0 KB Created: 2021-03-14 14:29:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 6ad48624a0585102d905b7ff3ed80ca8 SHA-1: fffa7091079e6fb47c016ba6dab2d74d995add5a SHA-256: 0cafe79d08fc2ba16d973b2a8dc5cfbd1b7af7e633f550127f992ad1bdf8684f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

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://kuzutuzo.ru/wix?keyword=documents+of+freedom+handout+f+answers PDF link annotation
    • http://importants.space/bosch_logixx_8_washing_machine_service_manualct9l0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366325/normal_6009aac3c4e1b.pdfIn PDF document text
    • http://topcabinets.xyz/22654363495h2ckj.pdfIn PDF document text
    • https://cdn.sqhk.co/daboxazile/SNEZ3D8/stickman_battle_mod_apk_2020.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/saeco_coffee_machine_service_melbourne.pdfIn PDF document text
    • http://uose.xyz/how_many_nitrogenous_bases_are_in_a_nucleotiden0izx.pdfIn PDF document text
    • https://cdn.sqhk.co/remuzebepilu/ggfhj5Z/zotifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451039/normal_5fd3552a9867f.pdfIn PDF document text
    • http://nesobaka9.xyz/nazu_amazing_guide_thyroidyvvpv.pdfIn PDF document text
    • https://cdn.sqhk.co/fezifoxunif/iahjgdY/pojujuf.pdfIn PDF document text
    • http://neriwor.medianewsonline.com/why_should_i_recycle_story.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/hbjaji8/royal_farms_rewards_balance.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417418/normal_5fe254cab2c35.pdfIn PDF document text
    • http://uscarins.info/modern_calligraphy_alphabet_practice_sheetsidl39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_575f3c7b9253490292beb5eac01623f6.pdf?index=trueIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_245ef5a209644dfd8be874c884062e77.pdf?index=trueIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_326722a99d044caeb0dd51f7b718de90.pdf?index=trueIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_38bbe21e6c7346a2ba4293afca744558.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/berkshire_hathaway_annual_letter_to_shareholders_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/tagodufelurel.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_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 5320 bytes
SHA-256: 9d7c142b1f3b7dd7a853bd44a737bbcbebd04fc6792c11494b0e3edec3ef402b
font_01_sfnt_off00010b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B72 10484 bytes
SHA-256: 51ed99667b79c9bd95225864217a3eacf9c4616f235dfa100ead47408adbbad5

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