Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3169702bf22391…

MALICIOUS

PDF

71.2 KB Created: 2021-09-13 15:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1f74cab526364856bbf05ef1d0889c07 SHA-1: f68e71e2e91c3f3fabb45db682e750543580b9d3 SHA-256: 8d3169702bf22391ac90d5363074b27a89ece1ee233f93a9ea0408acdd13b4d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms or redirect to potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The primary attack pattern involves luring users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://infrive.ru/uplcv?utm_term=varnakazhchakal+mp3+songs+download PDF link annotation
    • https://kasihpaham.com/contents/files/gubosazuzuk.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138f353c7343---38067296515.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fovixozivigapubiv.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210908223136.pdfIn PDF document text
    • http://juncheng.tw/upload/files/21943235648.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/66588708286.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/74324036334.pdfIn PDF document text
    • https://la-klamm.org/Files/files/newozafuga.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/kowukosagibe.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/71812169555.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/51158959035.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/betuzafanonomapowakug.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/83600062157.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/57993562827.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c972eb9eeb---kujar.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/71772627107.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/83333511282.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/75396500503.pdfIn PDF document text
    • http://happy-land.hu/editor_up/relanuzu.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/36188382829.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/94013978476.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/repifegivenimu.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/povifirexusuru.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/86443903260.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/nozugonidenidimori.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/vajevisojebusir.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_off0000b574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD86 15744 bytes
SHA-256: 3883fee06bdf54e756eee33be7ff899c635478ddeed600a1da6d6c7cb8923b98
font_02_sfnt_off0000f5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 11016 bytes
SHA-256: fcf85292adb3868f514ff0c53cac012c602cca7d7985de04c7f92e21faf9848d

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