Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83c66bf7b6db960…

MALICIOUS

PDF

94.0 KB Created: 2021-09-21 02:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 265657e9fb7c71625ceeeaff3a3afef2 SHA-1: 17d2c4dd5ed57ce887180f33428c2cf867e92c70 SHA-256: f83c66bf7b6db960fac8b6a2968420c52b53017e868809037462ab3fe5f245d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a probable phishing or malware distribution attempt. The presence of external URIs and the overall structure suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=gta+san+andreas+mod+apk+lite PDF link annotation
    • http://kassa.pl/userfiles/file/24264381964.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/82933991667.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/98421281254.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/1843580010.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/xozune.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf0bd276c---rarosobavanijezu.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/duvuzum.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/97264651745.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143fc5594d0f---satexuwadewubobi.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/sivufubotigusakurudix.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/lisagetupebu.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/nizukagufufasonaxapogagaw.pdfIn PDF document text
    • http://speckrepej.com/upload/file/46109105059.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/mifanizedonutosuk.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/tevelusasifax.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/2737429435.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/28143388763.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/sobuxaxamosanin.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/favufa.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/20378138607.pdfIn PDF document text
    • http://china-shengbang.com/upload_fck/file/2021-9-19/20210919000406712153.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368bfcee166---24059924607.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/migivebajigobotimidevebo.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_off00010909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10909 10684 bytes
SHA-256: 03904be5d0a946c71c65dbfe047142e68b8ca79612d0f80ae5763e2488a8becc
font_01_sfnt_off00012185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13997 18904 bytes
SHA-256: 5f2103d73a4b822edd4dad25b98e3040ce093ea78667eacc3723daedb859c7ed

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