Malicious PDF — malware analysis report

Static analysis result for SHA-256 2808a096b6a3f2a2…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 08:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 721f1b9fca200a3753d837ebbf0deb6f SHA-1: 1b1c5004596dac338bed55f7dbee39194c2bf3a3 SHA-256: 2808a096b6a3f2a26eca1a683eac96eeb7a7f46516e0e2b754cbafc616307ae0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using many distinct hosts with few links each, common in SEO poisoning or phishing campaigns. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious intent.

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://chcial.ru/uplcv?utm_term=glynis+has+your+number+pdf PDF link annotation
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/sikodoforoj.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/vugaxemixevizumiwerov.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/48153942228.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210904173041.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091706244688.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/godexomuvixuwosepen.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210909110440.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/52185454271.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/vakifivimelevomexofoji.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/29429646810.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/nawatapidajozow.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd1ddc25a8---notexezofelix.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/97372708306.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/80695034831.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/4451764459.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/305994261.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/verenakidowizubizo.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/bakofapasibowofup.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/befirotinibefozikapi.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/1721201872.pdfIn PDF document text
    • http://rld-carbon.ru/file/poderodivuzukilak.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/getin.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/94535107737.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/zojikofeniw.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130c5907602c---gazem.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_off0000dbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 18316 bytes
SHA-256: bb6e1906c4ec050c3ac5012639952342622b1c68e68b5985d34f7fdc4231d33d
font_02_sfnt_off000123a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A1 11056 bytes
SHA-256: afb7ddf14282443b985ca4400bf630f4f87966b39a27a0c446dad4fd1ab62da1