Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb6a08db21bb20a…

MALICIOUS

PDF

76.9 KB Created: 2021-09-14 10:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 82b8c6b27c42a8bced5d3ae22a31520f SHA-1: 7c8dc0e43caee1ed451728ef294470ecfe5c4d95 SHA-256: 5bb6a08db21bb20a5fb1262419200dc09ea9252f005c8a7340f51b05dc9af57b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. The PDF also acts as a link farm, directing users to numerous external URLs, many of which are likely part of a phishing or malware distribution infrastructure. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mariellatriolo.it/public/file/ragadetenizuxadalasi.pdf In PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/29526198338.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613baec714610---12129997492.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/wasuroxu.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/zadewufefusej.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/wosukemofozesifed.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/zapemiwuvimojis.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/47003512497.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/nulovajufewuvizulawuvumo.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/19948489587.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/4707456835.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/fikavoramofuvobebowavux.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/xidoxizelisuwipebagiforaj.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/85102452971.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16133efc1cc7e4---4536748381.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/1705952730.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/rirerikinazolumowukuj.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xizukemepulizitudowabupex.pdfIn PDF document text
    • https://dellrein.ru/content/file/44700422965.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/bifezizovotogoramuxalij.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/deropimarepob.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/71332903678.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161343d9841540---68562692584.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbc6a3312e---87264195920.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/juxen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=thop+tv+download+apkPDF 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_off0000ca81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA81 17616 bytes
SHA-256: 53d20aa6a7b4fb6d4664d6410779337ecaff67372069e1070eb4bae8106ee66c
font_01_sfnt_off0000f74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F64 10204 bytes
SHA-256: d6585b23dd90749d5089693b6b161d8d920365499458799bc74b8fb394cf0e48