Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2bf1899b80904a…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 06:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a547238eee70f43c4bd2e164812c696 SHA-1: 4df37988fd4196e050daf5536a06f171d43f62ec SHA-256: 8c2bf1899b80904a31a2b53b481b90c5b804714bd38661772e57b2f80da0a688
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. It also functions as a link farm with numerous external URIs, many hosted on potentially disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hantverksakuten.se/ckfinder/userfiles/files/62985646796.pdf In PDF document text
    • http://pallenberg-busreisen.de/uploads/files/lapifaxuvubanatupit.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/fawopum.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/wedajemowoloxozaka.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/37048673956.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/71422392193.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/talumez.pdfIn PDF document text
    • http://iscelenie.info/files/file/73848436570.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/60450871409.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/74840218396.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/57958460030.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/40508048380.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/6022861212.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/piwebi.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/jepidagonu.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/bofulapasisirilozina.pdfIn PDF document text
    • http://ipceurope.com/assets/file/76781266604.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/nenewo.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/1686305461.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/94796748820.pdfIn PDF document text
    • http://farmina.ru/uploads/files/48939737267.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/71662403240.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/nilapomosizutaroselixur.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/kozidaderulil.pdfIn PDF document text
    • https://cian.hr/userfiles/file/98816171072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+hero+academiaPDF 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_off0000d518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 10308 bytes
SHA-256: e3a2d787dddc8cdd6c0d8735fba3775376d3b259b9b2192684bfea307133a6f9
font_02_sfnt_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 18280 bytes
SHA-256: a6a2b16866b1635a9bd499fe16b361ee13aa530ea751597a3648a78a07746094

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