Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4abf9185f0d7459…

MALICIOUS

PDF

81.4 KB Created: 2021-10-28 16:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9ac2601a2f8971de7dd3353147982587 SHA-1: 8d90e96809f8846ea02ddea4802bb0effd8ed8e5 SHA-256: b4abf9185f0d745955fe90f66b3cf2c52e1472a8b020edf9dbf74c42708609ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hagabb.ro/ckfinder/userfiles/files/35602241511.pdf In PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/301753a7881946a438008d08e4a09392/gomofunuwixedulanajulom.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/pezakosujiparedetunem.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/55748326673.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/89645830474.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/45972214855.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/povegubigusamitepoje.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/68979036122.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/85631576103.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/86618988448.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/kenavugozibebopute.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/vakurivimadupavo.pdfIn PDF document text
    • http://linker-apps.com/files/nizaxudusatulez.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/wugilotometuna.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/fosoxepexusoku.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16176fef04b654---97244074245.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/34783867568.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/69519769839.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/52442434038.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/91919270646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/u-9XGpgKpwY/uplcv?utm_term=all+your+hard+work+has+paid+offPDF 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_off0000d9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 10632 bytes
SHA-256: c2021799fa89a9721767015e8e02afc3a9f2fc03df48ee1084455ea69d46647c
font_02_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 17764 bytes
SHA-256: 806dad223d5a90cdb5bb035e008a78aeae1a9dc493f50d858a1911ba92a48635

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