Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad200dcbe6eb7766…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 17:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ed91ad479cd075d94f7f8160969f0ab SHA-1: 8905a5934f05ec35424f525852efb999c596eb6e SHA-256: ad200dcbe6eb7766ff232b319be2e438e5e29d8e0d40ab8a99068b4d40aec105
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous external URLs, many of which are embedded within the document body, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, further supporting a malicious intent.

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://archism.ru/uplcv?utm_term=aboriginal+spirituality+symbols PDF link annotation
    • http://emanuelarombiarchitetto.eu/userfiles/files/38488994585.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/ropogas.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/19036413872.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dc0c06167---pamifulujefemidoborezilu.pdfIn PDF document text
    • http://mcutech.net/files/paxatusezalawuxexiniser.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/39320501389.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/sunok.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd083a0c7c---segivujidawipen.pdfIn PDF document text
    • http://tcihk.com/userfiles/nagixugoriwuwenufoz.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/54178295710.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210913060235.pdfIn PDF document text
    • https://vendax.ro/files/file/fazitel.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/37831719299.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/45169626570.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/luwuwuzox.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/58066647723.pdfIn PDF document text
    • http://immopolignano.lu/images/karajaxibubadikevanena.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/tapigivonuvewudugali.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/zapofuzegusetukisuviviga.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/31368987511.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_off0000d831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD831 10796 bytes
SHA-256: 5e0408645b709dfead5914a3d1848d66fb64545ebe7e4bb9ddc20bf99d4f0b56
font_01_sfnt_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 17348 bytes
SHA-256: 62819bc69bdd884510012cda3c9501db35c360eabe9040ecd1fe81655e203a65
font_02_sfnt_off00011d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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