Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f7a6c65c4534f9…

MALICIOUS

PDF

71.3 KB Created: 2021-09-19 06:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ccc5f2f1af3ffdb57e7be9288381977a SHA-1: 3a34e8222b4c007ddd8eaa5f0e5d6b2c82c703fe SHA-256: 95f7a6c65c4534f91d4c26e0e43119c1a2a317b9dc60fd9652f4201cfc20cb0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism to host malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination or distribute content across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://handientu.vn/userfiles/file/61685114418.pdf In PDF document text
    • http://gamecoast.by/uploads/files/99057217840.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/99687555605.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/dasokub.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/71969149180.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/feninebepibaroduwige.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/85353366676.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614338c75de28---dupijavemewomemu.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/roribeku.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/5802701994.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/24500329427.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/fikeriwupidudusalukivarol.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/mikutubikekuvinowoderiz.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/94737106440.pdfIn PDF document text
    • http://hidropro.hu/upload/60243500870.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/15874690399.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/96366015412.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/59778213580.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/42819993620.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/01ab14968993e4324901eb45fb821b4b/tijapilitipevusonekad.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/jebox.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/43827381307.pdfIn PDF document text
    • https://thehouseproduction.net/file/26494253004.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/sogitodamitikedogepam.pdfIn PDF document text
    • http://lactopad.com/uploads/files/fujuvomezoguwoxofej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+vice+city+apk+for+downloadPDF 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_off0000b637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4E 10840 bytes
SHA-256: 6f0012660f7eee9a09a201e1e2dc0a56ee318827726cb64124d6e7f167c6272c
font_02_sfnt_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 15672 bytes
SHA-256: 74c5cda18cf9ee5a539d7546d02cf61601bd6531db607091056f29f2d9a367f7

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