Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7419b32692fac43…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 02:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4dcdac41a28b209b354087a491a2c252 SHA-1: 45e1392f7928a7cba5b14976f849d95a314a11fd SHA-256: d7419b32692fac438fc1d09c3489a608ac883b82903be64751290b347886e6c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for distributing malware or conducting phishing. The presence of external URIs and the link farm heuristic strongly suggest the intent is to redirect users to malicious sites.

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 https://pistant.ru/uplcv?utm_term=avatar+the+last+airbender+episode+1+watch+online PDF link annotation
    • http://summitremodelinginc.com/userfiles/files/lalukijetidinedoguvupozu.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/53843139016.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161539d49c8199---63632133768.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/nedikumebumuxulekugula.pdfIn PDF document text
    • https://slide-bearing.com/d/files/setorilorosumusa.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0acacd19c4f927548bf7693c3693ec10/xifugolewomibev.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/53113672659.pdfIn PDF document text
    • https://proia.bg/userfiles/file/60692387200.pdfIn PDF document text
    • http://falconltd.pl/cache/file/dipemuvubokuloburojof.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/50904505053.pdfIn PDF document text
    • https://vanchuyensahara.com/site/files/jizumixisidunokuganepun.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/vepebekejorajalupe.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/nunadalawokeselu.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/lanalufekuw.pdfIn PDF document text
    • http://aqgwegfjdlk.handyfriendship.com/upload/files/47266676349.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/pegerejetitabufe.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/pomuwowazobopako.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/9504755097.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/vopagik.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/88502461090.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_off0000ada9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA9 10936 bytes
SHA-256: f803ce6b741b72a1f59c37fb26dd0c7de7176ba7c35aa2dea29d1c61931ef067
font_01_sfnt_off0000c6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D6 14848 bytes
SHA-256: ec63d6c09cfdf8410b48768768e0665bbfe3659e8ce97b3d652c31507cc722ac
font_02_sfnt_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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