Malicious PDF — malware analysis report

Static analysis result for SHA-256 4625d6641597e85a…

MALICIOUS

PDF

80.2 KB Created: 2021-03-15 22:34:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1dcc5f339eb8693c36ab21c3683f4bad SHA-1: 1058dd7ce485b6624a02844acd82e9267ec5664e SHA-256: 4625d6641597e85a057ba4d95be4aa8b95a28d8eeacf8bd380bbc72eec313151
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://lozipotod.ru/123?utm_term=collingwood+weather+report+7+day PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478125/normal_6019d5e6cc721.pdfIn PDF document text
    • http://zoneeuro.pro/46798690943ujyvr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445320/normal_5fea45c6876ee.pdfIn PDF document text
    • https://cdn.sqhk.co/suvotoruwot/XiehbrF/jimowumazu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501980/normal_5fc729b971624.pdfIn PDF document text
    • http://segway-wheelchair.ru/800_calorie_diet_to_lose_weight_fast46kaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486346/normal_5fd7ad1292514.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/gZpJmbF/tripura_weather_report_rain.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/fihgcwj/pitegiwe.pdfIn PDF document text
    • https://cdn.sqhk.co/rubogomuweme/ijjbhUU/88696665536.pdfIn PDF document text
    • http://sehq.xyz/muxepop4pyi.pdfIn PDF document text
    • http://tramlaweq.online/free_printable_cursive_writing_sheetsyieak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408718/normal_604109a99d7f3.pdfIn PDF document text
    • https://cdn.sqhk.co/sejarepezibo/XggCaij/recharge_mobile_card_scanner_software_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417669/normal_5fc7f20b53c9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421943/normal_6026def17438f.pdfIn PDF document text
    • http://tramlaweq.online/3_good_things_about_yourself_interviewqnhq2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_60324ca869b9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490547/normal_5fce7ca84f51e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nabifovu/xufowipafitu.pdfIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_76c5735479184932a7c910c3e16e024f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liguwubore/how_to_write_a_novel_synopsis_for_an_agent.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_81bd6d17c2c8478c85ed399472610bfe.pdf?index=trueIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_6dac561d250441e98b4a1aba0e66db28.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/mechanical_engineer_job_outlook_australia.pdfIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_ba46af8502c2487d9e11f1c2bbb41d69.pdf?index=trueIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_54caad2afc144ba995e3a466fd28ff72.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/verirejon/68536284901.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_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 5220 bytes
SHA-256: 1ed0766f31cd9eacb3a7fa427ae1457fe54b390ba3029886efdf4b15178657e9
font_01_sfnt_off00010d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 10860 bytes
SHA-256: ac260b43e01dfc016a526d7a811697f76800d98a3827c57398e706b10ce13033