Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb38fed14415b56…

MALICIOUS

PDF

69.1 KB Created: 2021-10-01 01:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 975c6c5d7e0d8d08f296fc40ee315a6f SHA-1: 91672c503c7a08e879fa86b61acf2cad82b2316d SHA-256: 0fb38fed14415b569a5fc8a892b61f1577103306706cb72eaa1770025e3b0495
134 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with a critical heuristic indicating a 'Pdf.Phishing.Trojan'. The presence of embedded JavaScript and a large number of external URIs, many pointing to potentially disposable domains, strongly suggests a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kozlovka.mebel18.com/uploads/files/setemulisasiku.pdf In PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/98195978244.pdfIn PDF document text
    • https://aventuraholidays.elladatravel.ro/mm/file/40981371801.pdfIn PDF document text
    • http://innotack.com/userfiles/files/zugubufudasisepu.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/36429014892.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/86826232697.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/24545264246.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/93953554469.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/76895970746.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/sijuduvitativarifidew.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/pomulidimarinapezava.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/43695163739.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/bokabisasuje.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/memonex.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/faxojovosizul.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/vosiz.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/sujoxusifavajanonofuri.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/57197735265.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/52398117858.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/7217990597.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/koparezegexaje.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/tk0rrfio0fablj2vrdb8901qo4/21191919057.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/80347975586.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/45353922670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=call+log+android+source+codePDF 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_off0000b18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18C 14788 bytes
SHA-256: 3ba45edbf0071f66d7b9d1c47d7a44ce8b11e1841ed0242d85ca9857b97a0f27
font_01_sfnt_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAC 10576 bytes
SHA-256: f4ca6a5d38641216f90957b97bb414895e6d12234bccf19d7dd890361141aa78