Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28859bc6f4f7c12…

MALICIOUS

PDF

79.7 KB Created: 2021-09-08 14:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9b7acb74e4d9965bed7ecdc30c0e7a09 SHA-1: ce4a19c048c20d191dcba692adb469e0eb26c479 SHA-256: b28859bc6f4f7c12c19e66175d8d760c8b4f6b76f294b785d0209bd3e6c5363f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The embedded URLs and the heuristic indicating a link farm on disposable hosting suggest a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=schengen+visa+application+form+download+pdf PDF link annotation
    • https://superpart.com/files/kazojujabijadov.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/92834856847.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/83463570892.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/8489417903.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/jebezeferulawame.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/efbb95d8f31209aa8e43746893bc7ad6/wemaponupezez.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/70511464148.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109061935223210.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/97563027672.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/8994523120.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/84030746744.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/20303414972.pdfIn PDF document text
    • https://elemonbg.com/Files/File/vesaku.pdfIn PDF document text
    • http://artepcb.com/upload/files/90142226853.pdfIn PDF document text
    • http://skolky.info/foto/images/file/33428340020.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/foxemotusuvijanum.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/27456226644.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/66104419390.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/81567261645.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/fasabawekufimelepesevu.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/91813971289.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_off0000cff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF1 11292 bytes
SHA-256: 3746bd7b08192f544229ea3ca970775f0bb432e6a08b9bcd3168755cf545d91e
font_01_sfnt_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 18136 bytes
SHA-256: 018936342d8c0074715352170fe16507c8e63aba915d97448ac4773e76b6c20a
font_02_sfnt_off00011954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11954 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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