Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0670a5dd9163ab…

MALICIOUS

PDF

72.3 KB Created: 2021-09-19 06:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1afdf470b78597e851597ffbf072bd2a SHA-1: 8a32c1b3d849400005c9fc786ce910c692f001cc SHA-256: fa0670a5dd9163abe736d684a3309e9c4d34d201e079e06a2af3e04c67f78e07
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=simple+game+using+android+studio PDF link annotation
    • https://amthanhanhsangchinhhang.vn/upload/files/47662862669.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/penuse.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/pukul.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/641910426.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/sulilifudoxifosijuw.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614681c32c0e3---14908118475.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/91810019916.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/70313305406.pdfIn PDF document text
    • https://yodobashi-church.com/3645574869.pdfIn PDF document text
    • https://epiphanych.com/images/file/32861058251.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/38629219636.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/nurebimufusofexulegalaja.pdfIn PDF document text
    • https://tch.lu/files/files/17661393406.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/98556439729.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/wafinorezitexadabirarut.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/worapofadovibusegat.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/pobutulemeragowewe.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/julimagesuzaboxuli.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/sulijunaraloguzetidi.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/66240377996.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/68643566676.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/burubogokegum.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/884516708.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_off0000b83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04D 16400 bytes
SHA-256: e63bfca76417766a110462c9fafe0642f1265d0ccea55d6fc5e74b951e3e98f9
font_02_sfnt_off0000faaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 10908 bytes
SHA-256: b86ae7040b2435f40e93fa5fd9daf83d5060f02d251b22d24c631d69be84cee5

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