Malicious PDF — malware analysis report

Static analysis result for SHA-256 784995eaf8a780da…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 08:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e965d00ec882f5fccbbe2dc3baf35d51 SHA-1: a8adb9d83c2e140d96d828cf691289ef8ba3d419 SHA-256: 784995eaf8a780da96a66b9ec2ba20506f8e40996db64d8db8e57a85eb8dbf3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://kapelski.pl/userfiles/file/nisisedolewibawekuxeladi.pdf In PDF document text
    • https://pecintajp.com/contents/files/76136620447.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109080853169643.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/72684895544.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/jubuzux.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/84596820853.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/57267563293.pdfIn PDF document text
    • http://rayanchem.com/d/files/binoku.pdfIn PDF document text
    • http://posuni.com/userfiles/file/budisaxenutifusefenaki.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/73424825251.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/51609803662.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/fagurilek.pdfIn PDF document text
    • https://arerp.kr/data/file///9222867566.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/74376071985.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/67385585292.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/parubevusuxazum.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/gutiwezutup.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/xesolidulefokexes.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/pinozafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+country+has+the+largest+coastlinePDF 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_off0000df95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 10716 bytes
SHA-256: 3384ab3acb2ddd992bc9f528cad623b3feaa3936d04fc226949eb152b0872fed
font_02_sfnt_off0001104a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104A 18500 bytes
SHA-256: 77950fff70a3ba7a9c9c44cc96db89ec49f81547d91e1a72bfe1275c41a3c57a

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