Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9fe35a10c9c18e…

MALICIOUS

PDF

72.1 KB Created: 2021-09-27 20:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b73093c580d4c8dacf1a91e251a88f5b SHA-1: bcb2384134a228742848f8b20431dc81c843a531 SHA-256: 6c9fe35a10c9c18ee5c8dc92f71d0b3b5634e526f6cfe0dc0658d22d6c4ed992
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs point to numerous unknown domains, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

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://reichspfarrer.sk/file/48100494629.pdf In PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/56312892598.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/josuzenelajuwe.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/wutetizugavupom.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/xivaza.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/mujisunebunewigunib.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/lupodikogufivajugipufin.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/tumunekepi.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/31150240775.pdfIn PDF document text
    • https://transturist.transturist.com/ckeditor/ckfinder/files/files/12434756518.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/80628763219.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9fee403ec0b9048d8a2a9aba8f63a15a/fejozovifigexom.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/48812973453.pdfIn PDF document text
    • http://land89.com/ckupload/files/nedotupeduxusewibiju.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/luzanegopofogefuj.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/wuvotuluwamirifagonawifet.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/ralolidumemitizipugixofad.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/vobojaxaxeke.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2f8de1fb0ef1e2bee2d70a58df95706c/nibova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=import+ics+to+google+calendar+androidPDF 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_off0000b210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB210 18576 bytes
SHA-256: fc6ef66fe4c7b7b381c31c41a835a2ba49185d6f0e012599fb5ecdeb544490ea
font_01_sfnt_off0000e1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 10808 bytes
SHA-256: 4ec0542b8f1c0ef0f8b140cd71aed7159cd6b6290965c0bcc086e338ae8c318b

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