Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd749c0b46bf6bac…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 14:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1e3f0a43b2c7896af93131a5a8ecb70 SHA-1: c30103dc8326150f5e3da47b0a98a6b3205a6360 SHA-256: fd749c0b46bf6bacc39d3be78ba6de08f018ddb2275872812dff5c887cf1b894
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to facilitate the redirection to malicious sites.

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://krisoc.ru/uplcv?utm_term=how+to+install+siri+on+android+phone PDF link annotation
    • http://pol2-simf.ru/userfiles/file/vaninuxiwodifa.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/83959638905.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/soluxatogefuxudotuwolo.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad5cdbc2a5---53952338725.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/mamelofamepapazutulawav.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/sefulukazedozu.pdfIn PDF document text
    • https://onlinendttraining.net/files/41493093174.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/32064707903.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/rakulenesotidagupaguduzi.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/wabegam.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/venebifaro.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/66510016544.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/39281436740.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210916_012757.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/77282327291.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/36345109875.pdfIn PDF document text
    • http://ustunongel.com/image/files/baromokerewebavoruze.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/24132946293.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/labupagabisopalemiralo.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/xugiresumitukegu.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/56517402243.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/53745068057.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/54051268224.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/xawoxaberelunixovabupoj.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/totabixewa.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_off0000e7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 17620 bytes
SHA-256: ce941d2bbd7a62d343035e4c3eb0624e74dfbe95afb0d9e0c3e6b059342fb9d1
font_02_sfnt_off00012e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E01 10568 bytes
SHA-256: c0f332829bbd4c1b9c67dfe1a5ee6f3e3097260463968d99a8b974e346ad3fc5