Malicious PDF — malware analysis report

Static analysis result for SHA-256 a440aefc2d26a4a7…

MALICIOUS

PDF

93.7 KB Created: 2021-09-11 21:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 943f182b9c1977c555e067e9ab6f5154 SHA-1: 3db6e983f1fd7dcc11eb628043f88455b1776d3a SHA-256: a440aefc2d26a4a747b723f174bc4c12c12f5af06ff04315df33a44c2e4b1d91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of external URIs and the overall structure point towards an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crysiq.ru/uplcv?utm_term=white+pages+queensland+australia PDF link annotation
    • http://quangphong.vn/uploads/image/files/tuniwobobuzu.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/95766068004.pdfIn PDF document text
    • http://mebco.ru/images/file/5491148878.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/16681260552.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/74407628532.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/90633948981.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7038576b---wenifowawunetoliza.pdfIn PDF document text
    • https://onlinendttraining.net/files/87367136940.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/darug.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/rijulojezu.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/12682906371.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/22665058577.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/wunakovozegegixijogamol.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/52864098742.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/gupomevovabikotikagebavub.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/jadixawinuvara.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/59809078083.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/42561901854.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/92630413010.pdfIn PDF document text
    • https://zzhqhi.com/d/files/37442404796.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48335623081.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/fabitukipimofitemigete.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/13018254079.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/runadebibujatofikix.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://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_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 19548 bytes
SHA-256: b99ace3cdf4d27d4530e971dbbe869f84760d6ee3f8ab592530bd65b9e24afa6
font_01_sfnt_off00013854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001506b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1506B 10788 bytes
SHA-256: 2e76c2e36022d88a159f1276235809e90bf480a91c39f509731e8fa3ec1bf870

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