Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ea929c33426cc8…

MALICIOUS

PDF

86.3 KB Created: 2021-09-18 00:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c091dc851f8d44cb2657182924434f8 SHA-1: 82896b800cfc7d3559ef1df080c1ad2766642846 SHA-256: 29ea929c33426cc8ded71e69c65b34724f0a5f60c9706bb84c055d69dfd816cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://reazfarah.com/ckfinder/userfiles/files/nuwapadisoxobiketikubi.pdf In PDF document text
    • http://handbook.hu/upload/page/file/92835908558.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406c49a9d57---47670209616.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/40570347989.pdfIn PDF document text
    • http://poliinc.com/upload/files/41068481056.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/50272458288.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/vewodosefakujozezo.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/senudir.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/fabasowuj.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/kezisiwobojimuvisilafefes.pdfIn PDF document text
    • http://falconltd.pl/cache/file/25256265513.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/87458162388.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/miverelivesiv.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/9792663345.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/kofurobutubejuwudaxuri.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e9f9d5667---50849683555.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/8819158009.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/77853666154.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/kafupesimuwiruruw.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/matelebipegozizukujo.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/revewajizedaruvikur.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/73335889071.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/tofiziweteta.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210902122019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=build+android+kernel+without+sourcePDF link annotation
    • https://source.android.com/setup/buildIn 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://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_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001028e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 10800 bytes
SHA-256: 702e6868c8b211c3051e787e27cb53e46d963e48350c62e40a274c65247da576
font_02_sfnt_off00011b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B73 18292 bytes
SHA-256: b9002cdd60e238e21c3913a4f1a6f529ef8f22440f930e43c0735ce82bf47a73

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