Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f3702d7b04df01…

MALICIOUS

PDF

68.7 KB Created: 2021-09-28 02:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7cdbcf5f1b456df655bfcc36ce81ba13 SHA-1: 7f9fd92a9905f4c72a2e20c571a4dfd921f2edbf SHA-256: f1f3702d7b04df01ea336523070bc4e45fdf69422cb6c7d6f625bafa451fde39
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-only facade with a clickable action, typical for tricking users into visiting attacker-controlled URLs. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs, many pointing to PDF files on potentially disposable domains, reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://bengalroys.com/ckfinder/userfiles/files/guxosowobowufanejitositir.pdf In PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9a2c0e19e---rerilitexowepesun.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/41730014701.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/todopifepej.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/97821639314.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/38281409142.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/kuxivup.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/pefen.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/11618338598.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/xogopawide.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/63406749847.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/lewut.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210909213237.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/vobaxodexa.pdfIn PDF document text
    • http://ndt-ultratech.com/files/48291133427.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/wezigadejaruxi.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/penoket.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/pasifodoguwib.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/zawajelow.pdfIn PDF document text
    • https://gilbertems.com/videos/file/67228060863.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/detuxigegugamo.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/52417065697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=one+on+one+2014+korean+movie+watch+onlinePDF 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_off0000adf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF5 10968 bytes
SHA-256: 7f918e1fde46a777a3b117c4ff30745127f984991db976a9a453cd486c33fe4f
font_01_sfnt_off0000c760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF72 14356 bytes
SHA-256: 1ba067e24e10d5a40a64adfcdd2972170920ed5d50f346b2617b4ce5eeea64aa

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