Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec539b9271b6522…

MALICIOUS

PDF

75.6 KB Created: 2021-09-16 18:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32974a7f5778c4d3c55bec3ed705ba9c SHA-1: 7b6b827ddfcbf0bb38f4873f402cf141a7247b6d SHA-256: 1ec539b9271b6522532d55280698ab4705168a6b2f61e72a8fa0e875a346968f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious content. The PDF contains numerous embedded URLs that point to external sites, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the interpretation of this file as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://thefertilizerequipment.com/d/files/64056303756.pdf In PDF document text
    • http://nuraski.pl/wsg/userfiles/vozovavuzivozel.pdfIn PDF document text
    • http://synphabase.ch/upload/file/2702014305.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/zufisotevesafiwan.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__612FBEF73DE88.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/tikekavu.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/muvazada.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210910034636.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/9814598134.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/50551359160.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/72852544382.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/73430297493.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/pubegi.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/1456bdab7ff1d19ae6d42e7fbe6a2e1b/47392830405.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/kivekudejuladaxu.pdfIn PDF document text
    • https://matrixx.lu/images/9435283959.pdfIn PDF document text
    • http://myphamasia.net/upload/files/32768487702.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/judaritexul.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210907_0C7FF4A698A2C963.pdfIn PDF document text
    • https://mashura.co/userfiles/files/24579056176.pdfIn PDF document text
    • http://aurora-c.jp/files/files/59835636470.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/40322355592.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/d55d520c288a8f725416ac447fbf1098/kebejuluxajafikusovu.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/fosiwabopug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sb+game+hacker+old+versionPDF 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_off0000c326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 17256 bytes
SHA-256: 643f7f03b01688cacf2c8786ce5bdee109257720deedc442cf61b2541032b097
font_02_sfnt_off00010783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 11092 bytes
SHA-256: 86495000062939fceea4674fde5179b6ae09e6b28406336307091765180d594f