Malicious PDF — malware analysis report

Static analysis result for SHA-256 8119894facf0584d…

MALICIOUS

PDF

76.7 KB Created: 2021-09-14 18:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6048866084240544fad8e78ada925f48 SHA-1: 9b83eddddb18a3811367bcd9d293a2c0e331e3d8 SHA-256: 8119894facf0584de4fc18c10b0a96999dafd94686f3a2b83a9abc36e4538c9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, indicating a likely attempt to distribute malicious content or phish for information. The presence of many external URIs and the link farm heuristic strongly suggest a malicious intent to redirect users to potentially harmful sites.

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://crysiq.ru/uplcv?utm_term=screen+mirroring+android+to+ps3 PDF link annotation
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133b376274ef---23929149920.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///52245130499.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/25027381345.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/3326230991.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/94417965714.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/dokuv.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/40313912814.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/58910292701.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/18056761457.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/xumaruvibeduwilukuja.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021091300340770554.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/gunino.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/66226282790.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/jituguluxivugorepe.pdfIn PDF document text
    • https://spacio.hk/attachment/file/gagatoxig.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/lipowuk.pdfIn PDF document text
    • http://m2m2design.com/userfiles/73356039839.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210906082358345.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/77370823478.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/32479704425.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/47278882673.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6629c6d20---febeg.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/39181578579.pdfIn PDF document text
    • http://pactolous.hu/upload/file/gasugukidogof.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90622591528.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/12548032270.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_off0000c5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F7 11056 bytes
SHA-256: 0314f084852521e03a1bdf73a98353998dd761f2a3f5a0852c23d4d0dcf42e18
font_01_sfnt_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 17760 bytes
SHA-256: b561158d52b4aec3f1b02601c10bee6aec511fe30201650e513663402c4a808e