Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f80959c44cb755…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 15:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 943299651fe56ab07ce6fb6161cadfea SHA-1: 3b31454e78d64c807c2da4d52dd49d8462ed382c SHA-256: b7f80959c44cb7558ccd0b1b289ebe05e686ee09318b61b121a00bc08b71ae2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting, characteristic of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious lure. No scripts were extracted, but the presence of many external links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=pacify+horror+games+android PDF link annotation
    • http://say-international.eu/userfiles/file/72119260384.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/21742487766.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/rukanimaxadita.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/15954242487.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/topaneze.pdfIn PDF document text
    • https://gilbertems.com/videos/file/622894745.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/75008143271.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/86976418920.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/43327483612.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/gigememusitenidewir.pdfIn PDF document text
    • https://anakmeong.com/contents/files/sopakoxerosujatoz.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210907_4FEAC9C0CB391714.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/tilaxotutamipusezizebux.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/xasepezulinawatoxosam.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/dae144e22ab315184398d0d9503320bd/31422300203.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/magelukidesug.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/nanubolitezokukugemufif.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325f6bde578---bapisuv.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/65444952098.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/regafekovamifividusasoxat.pdfIn PDF document text
    • https://stotex.rs/files/54054138688.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/muluwisadukosebub.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/bidaxisexunexedobusawar.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/wabidulomafesoxalop.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/nudoja.pdfIn PDF document text
    • http://bit.ly/Pacify_PCIn 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_off0000e0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BA 17036 bytes
SHA-256: 4e8c2c3097231bddd2f1c296c66b83dde8b96b289ccf7774f42d51b573b699a6
font_01_sfnt_off00010caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C6 10892 bytes
SHA-256: 430aa255b8893d92f558a898f0b3a8a0451284af0a56a12e85874248c24554d0