Malicious PDF — malware analysis report

Static analysis result for SHA-256 4011cce04d43db00…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 10:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f03c1915d53f1244c8d0c291f3771511 SHA-1: dd02a359f0fb86acb00e9803e85ab740a330e82a SHA-256: 4011cce04d43db0077212847c7ed60ec69c272ad39a3392fe214d5f2b62a6b77
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains and an IP address, which is a common tactic for phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cudicio.it/images/file/56292063532.pdf In PDF document text
    • https://heureka-cz.eu/files/8999824407.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109082259569989.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/49741230977.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210904_9805AC2105C34494.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/sevana.pdfIn PDF document text
    • http://xtra360.net/campannas/file/76704226169.pdfIn PDF document text
    • http://noithathoaphat11.com/upload/files/bubizelemusij.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/34775704259.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/36450404778.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/48244767420.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/xolaleri.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/87317594881.pdfPDF link annotation
    • https://congtydaihai.com/upload/files/5557780073.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/wujetupafawex.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/92928897766.pdfIn PDF document text
    • http://webs123.com/userfiles/file/71464286160.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5097460691.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/86866142892.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jipusefusamev.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/20630068341.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/sifovajisibujiwik.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/jarupovegijoturefife.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee40a95ec---73618944613.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/nedarajudomu.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/45796493177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=galaxy+s21+screen+dimensionsPDF 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_off0000bded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FF 16496 bytes
SHA-256: a45f12648755a0dfad5c208c77cb25aba692b9ab6216a0fe909cf3f8ea823250
font_02_sfnt_off000100d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D6 10860 bytes
SHA-256: 12c7b6d1e62dc613a5a80462d21f35f4cb30b25d0bbfcdc1a09951ee7bb1be7b