Malicious PDF — malware analysis report

Static analysis result for SHA-256 707a9b4dc30554a2…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 21:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c1bbf09117f26a7837b4e3d03ea62e61 SHA-1: 1472810f4386a5325254961af93c684b5bf7c8f8 SHA-256: 707a9b4dc30554a2978f4da7d09101b9686c1b4d31933f1cd84b46456c8a99aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains a high number of embedded links pointing to various domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and numerous external URIs indicate a potential for malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://clearpatth.com/userfiles/file/rolovifigusesawuzezimeru.pdf In PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/67110530129.pdfIn PDF document text
    • http://precisao.org/files/files/24947649319.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/nefopupugiwozijezuve.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c194f130d---worosemenudoxivizogo.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/kosivoxinejamurob.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/pumalivizemegejapefebure.pdfIn PDF document text
    • http://xaydunganphubacninh.com/webroot/img/files/jajofozefidef.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/16653718736.pdfIn PDF document text
    • https://tebra.si/userfiles/file/1577174021.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/netefobozuro.pdfIn PDF document text
    • https://fivetc.net/uploads/files/49593759109.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/26734590932.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/82123484744.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/38821646186.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/59083112726.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/21579071400.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/67900453906.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/4847ia0srq6ci5bbognvk65j59/45979142616.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/manegivikagotogexovemeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+ldplayer+for+pc+windows+7PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB028 10768 bytes
SHA-256: 1703a93df28ba69e5aa50b9501b5859311769864793408f75519ce90633f545f
font_01_sfnt_off0000c91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91D 17324 bytes
SHA-256: affe334c474eb530ea5f3d6a9402cbf60b02540a0dd054a2aed40140d78ba120
font_02_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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