Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1efba6c1649634…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 00:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e8b4207a203d9d2ae98420f7a34f497 SHA-1: 9b1fa0e3328a276809246a349931aadf959421e3 SHA-256: 9f1efba6c1649634803749bbf472e8b4fbc211832ce06d5a94b465398ebadefd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9ed8a45b9617a1c95602a3beb40bd9ab/puwuvejukifurinalapam.pdf In PDF document text
    • http://a1-automotivegroup.com/upload/files/76645336865.pdfIn PDF document text
    • https://badoza.net/userfiles/file/wozapovosowatidoru.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe2a5a7aea---52434021931.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/51102879451.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/gufajewibaroralugojex.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/53606100145.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/fifuzawasor.pdfIn PDF document text
    • https://conrays.ru/f/data/63957373176.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/3176066472.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/lavopexoxamatozefibuvi.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/91918831342.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/bebapimo.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/vogimiba.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/zazukepunonaxuzidixiw.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/54087555040.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/34440973717.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37095294609.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210910100835_1547859841.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/97218705126.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/jifunojemerid.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/37387732122.pdfIn PDF document text
    • http://rld-carbon.ru/file/2198436482.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210917201849117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=doraemon+unreleased+gamePDF 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_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 17892 bytes
SHA-256: 1ee419aade1ec07e427279bbf0a40f1046e835ef8a24e4b90af630b350ba7d5e
font_01_sfnt_off000106d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D8 10504 bytes
SHA-256: 8c1e5047fcdded1794c12ef12ad12dcfcdfcee0f1f5e07985165b179a00cc11c
font_02_sfnt_off00011e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1