Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce185d8c559b2fe…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 23:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 56f4561c19d9dd43160c71764694fb03 SHA-1: 1f9430eac9b107c15bcccf1b652875dd3e3e6cdc SHA-256: 6ce185d8c559b2fe7f7bf46d4ab2acce023b6493fc8b026f99fbaeda21cd0778
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which appear to be part of a link farm on disposable hosting, a common tactic for distributing malware or conducting phishing campaigns. The file's structure and the heuristic firings strongly suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=friv+selena+gomez+date+rush PDF link annotation
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161409b6cc6921---nunodedokebutavitewugozun.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/pilugegoxujazumufikemifi.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/bakegametimisabafawix.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/87689406822.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/xamatapepu.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/25545160879.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/67853005885.pdfIn PDF document text
    • http://pvvc.cz/files/12984910513.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/bikosumabu.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wiwofamuriji.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/35769286522.pdfIn PDF document text
    • http://abwva.com/uploads/files/nixewerubi.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/16746634271.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/10713572724.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/taloxapeputepuxuzajefawu.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/46396684940.pdfIn PDF document text
    • http://mweb.cz/images/file/70386518125.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/nisabilaxeramu.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/14558655660.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/42006322776.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vogenibosejetelewi.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/lutug.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/jezivoxadax.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_off0000cac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 17532 bytes
SHA-256: 4ce6eff7398673d5d181b8cc9a40b8142929cf3cf455465392a708f78a9985f5
font_02_sfnt_off0001107d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 10896 bytes
SHA-256: 3b097313ca0a0efb810dbf219c3f719f80730ed87c32fec3482bdb2799206a85

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