Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d7bedf747acced…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 18:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1cbfd3871f22343fc43091535cf4f122 SHA-1: 04eb6a53d0d77c2defb6b5ed3d6dff1a2353bacc SHA-256: 44d7bedf747accedcc3c61966e82a0ab54501a0284b6b2129d5dea65e126b551
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. The presence of external URIs and the nature of the link farm heuristic 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://laborke.ru/uplcv?utm_term=mx10+android+tv+box+user+manual PDF link annotation
    • https://elitstroycraft.ru/source/file/78774518264.pdfIn PDF document text
    • http://video-cycling.de/files/file/11076228620.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/tusugugekonameworesutexo.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/80677238865.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/vijowegasegikusol.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/fudav.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/sesetakinotofimogolu.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/vejubezemifivexidi.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c191d475ed8---givexi.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160779394b5898---vokozin.pdfIn PDF document text
    • https://designclarf.it/file/36377791912.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/66659345888.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/neviradeborefitixanekaki.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/68957688896.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/69974006212.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/71593798313.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/dimemixefun.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/wumijibaguvamunezezinep.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/40415221910.pdfIn PDF document text
    • http://lphs-the60s.com/clients/5/5a/5a84a5cabe7f31a06b4bf99f7e1b7ad6/File/bedotijevoromo.pdfIn PDF document text
    • http://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/tufupumovirusekomikimip.pdfIn PDF document text
    • http://apcmagon.com/userfiles/kopuna.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/31485919451.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/remarujidarugozolupafig.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_off0000d954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD954 18276 bytes
SHA-256: 77a697a37a9dcd48f9cc2c6b340718fdd5c1b2090e5b502b92a0f1532d9090bd
font_01_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12073 10984 bytes
SHA-256: 494f31b2884de1b2f22604b9e8d9961a9624df037909ffbd99f113da64727e85