Malicious PDF — malware analysis report

Static analysis result for SHA-256 4174aff8c026b6d7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 15:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: edec4f4de6ed168d41e163299a61ccd9 SHA-1: 84e2340df8d39de21fef56047adef020bed99475 SHA-256: 4174aff8c026b6d7edd1afa060bc4f36a44d450fee44736c2e4aaadd54352d7f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of numerous links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pixomot.ru/uplcv?utm_term=the+one+thing+gary+keller+full+book+pdf PDF link annotation
    • http://madmojo.com/fckupload/file/zajara.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/34433776970.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/molorotozujobopogol.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210903002508_lxnb5m.pdfIn PDF document text
    • http://myesen.life/userfiles/file/83548533209.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/bavuxifadira.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/62532350728.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210910075501592764506.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16135d8f524f71---92223333299.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/83284052189.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/gevapulonu.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/84127385297.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/jivedezawigoruwosawejuvor.pdfIn PDF document text
    • http://talleresjpg.es/img/file/97249230123.pdfIn PDF document text
    • https://profm.hu/files/file/60558999357.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/17868757727.pdfIn PDF document text
    • http://hoachattn.com/image/files/37511263739.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136acf6597b1---61139930539.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/zuvogiruvevitazamosasud.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/67655882240.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/46067205515.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/13130758075.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_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 11020 bytes
SHA-256: bd259cfd050bae245e38ac043a33889482ea0ce93ad91491be7566f97ef30d68
font_01_sfnt_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 17808 bytes
SHA-256: 62c3fbc7b5788a01edee32c82a1149c9dcfa977bcdf79eeedc1d71e2a6c13384

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