Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffbee9857c6969c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 04:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e113507309252b5a8687f6270049fa58 SHA-1: 2f45ae7c253252ebd7612f6e3917809d769d0a41 SHA-256: 4ffbee9857c6969cbbbedc7422e4b175de8a055ef681f3ed831a5582dc740071
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm on disposable hosting. The presence of multiple embedded URIs, including one pointing to an IP address, suggests an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its direct intent, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://studiotecnicolamanna.com/userfiles/files/fajelekovafafu.pdf In PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/88703929221.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/panorapekewazusijuzufapet.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/64493034405.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/jekisopefekafupaxa.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/jodasiganuwakatetuta.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/pituzabot.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/46788450086.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/gebavidiwokodonijikegi.pdfIn PDF document text
    • http://sarlampa.ru/In PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46299839645.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/19072904325.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/49104889038.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/28692122291.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/33752882697.pdfPDF link annotation
    • https://grafconsulting.pl/Upload/file/juwebumakarudezok.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/fegodawewimokuruxajepat.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/tafojubowiwilarogem.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/62191923724.pdfIn PDF document text
    • http://artepcb.com/upload/files/69916970562.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/66110981222.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/64633844590.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/91385091882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=electromagnetic+radiation+which+has+more+energy+than+infraredPDF 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_off0000d668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 17900 bytes
SHA-256: a912ccbea9ef3bf0259e1d2abc328f74768a63f5fedad24bfe3155230365d632
font_02_sfnt_off00011c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C98 11108 bytes
SHA-256: 56c4f72f58065a09781d6b6ae4e9742e66a74fc6689cd715566368cd16ac137d