Malicious PDF — malware analysis report

Static analysis result for SHA-256 a095441d7333f9c5…

MALICIOUS

PDF

77.2 KB Created: 2021-09-22 10:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: acfafa36d3ab563a2f6ec123b1978cbf SHA-1: 082116f666c8c259ac3261e2ec34c51b641dd24c SHA-256: a095441d7333f9c5bcc739517cfd7d43f358dfa065937b2a3a9d47e2251d7c72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous external URLs, with one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The PDF structure and embedded content, though heavily obfuscated, are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://highdeal.linkeo.net/ckfinder/userfiles/files/mosakifemo.pdf In PDF document text
    • http://dorrstrechy.cz/UserFiles/File/75257427966.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///luzelumorukawejirabaju.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/92359e343a7efd6430d1fbc9e9685d31/fezetozisolofurixebojul.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/9441761361.pdfIn PDF document text
    • http://e-sheremet.com/img/90118024145.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/xajawilokubedefudomuxedog.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/24542512366.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/robusigofabevelugujixet.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d95cc7ff2---41977127374.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gepeluvatobov.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/89128651241.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/vaxukufamuvemak.pdfIn PDF document text
    • http://glttek.com/userfiles/file/dajusobajowezozabu.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/384703586.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/bopafekuvowasitan.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/bavivar.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45771934110.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/93384127525.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/vigobe.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/xasilanadunogoraka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+legend+of+zelda+the+minish+cap+gba+downloadPDF 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_off0000c9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EC 16764 bytes
SHA-256: 2f38e082697a3509af29e32dedbb501979c3dc0ca24a1c8029d058543d27d469
font_01_sfnt_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 11216 bytes
SHA-256: dbabfb6dfa5556745756606181cf86044b21c062dd98336dc1634652c552d870
font_02_sfnt_off00010f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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