Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af41f1f84507e8d…

MALICIOUS

PDF

69.3 KB Created: 2021-09-09 20:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b7b2b5e6e811b7d2794b944637f114b SHA-1: ee9b2a9a3c446a477d19bae46e05340ef1c95168 SHA-256: 7af41f1f84507e8d8126d0d1d9e9b2e68e61efa98f863bb3344ab386ce27adde
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and the presence of multiple external links point towards an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=driver+2+game+download+for+android PDF link annotation
    • http://tucholainfo.pl/userfiles/file/kovotur.pdfIn PDF document text
    • http://chinalabware.es/d/files/21244113801.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/48170960149.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/69947644884.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/koxasiwisusufup.pdfIn PDF document text
    • https://heureka-cz.eu/files/22188188677.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/defusebidamawekowetinida.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/fekabadipakofubebaledugu.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/19490977472.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/jogekidekuwevizaji.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/deedo1ejuj7ipef2r7q1ke4bi3/ronevutizasa.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/goburadupefivovoragob.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/mevabubotemes.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/redizuwofejupejexofigoka.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/zilisiwimuforinoke.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/10286322528.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/90578780158.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/37481333620.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/39306960185.pdfIn PDF document text
    • http://hanauhrova.cz/files/nadugisazudiwinitun.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/zudaxi.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/47946811109.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/35948658062.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_off0000b1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A9 14976 bytes
SHA-256: d026b3d813e59d131f346846fc38e962e63d89b38a96b38658fccf4539fc3f1b
font_01_sfnt_off0000d78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 10704 bytes
SHA-256: 6c20c2b7596d9522d620dd3c96239be9a70516b0e900cc767ffc3a077b25f2cb

Open this report in the interactive analyzer, or submit your own file for analysis.