Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b94b3723108188e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 22:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2faa01a85e93b0775bcdd28a815a283e SHA-1: 4fa0fbf33cca69c8bede8cad4f1f34342b692634 SHA-256: 1b94b3723108188e3593395067f362e92bee7586d012d530de33b38c1489f896
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to potentially disposable domains, suggesting a link farm or phishing lure. The primary attack pattern involves directing users to external sites, likely to harvest credentials or deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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 http://www.fred-robin.com/ckfinder/userfiles/files/50339668109.pdf In PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/78940108847.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/2199089887.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/75339380829.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/34844725516.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/xaberorevo.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/pisoxowarabapuzafujititif.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/79309161375.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/df0rm8in6smrpdruamag106efb/vaforokefagezo.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/givujitezegofiwekone.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/31935268800.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/97790365254.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/ratamijekesamumolarobabiv.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/75822285843.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109091024352251.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/14961828168.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/wudemumun.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/mavezo.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/13033928051.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/76vl280463q8puk6kj5n78dac2/puvazajawomirovadopep.pdfIn PDF document text
    • http://ombs.ru/uploads/files/xuzusawigolisarofazuminu.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/34107019736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=best+hd+live+wallpaper+for+androidPDF 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_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63F 18532 bytes
SHA-256: e985b5ea75a6d95bd0d75ae424ec00253b3b579759ade6d9910adca7a65608c3
font_02_sfnt_off000125f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F8 10800 bytes
SHA-256: 584e72f5621e9f1623443b5dda04535ca7a581580e3828bd473c65498cd7eb22