Malicious PDF — malware analysis report

Static analysis result for SHA-256 168f964ca722e8b8…

MALICIOUS

PDF

94.0 KB Created: 2021-09-14 12:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 697673cd46eb0970b562714bd4ee38ce SHA-1: 0405b908c3b9fa3a33f1a53ff7e8cf188eb9584c SHA-256: 168f964ca722e8b8743d9076f8c0872013f857d8a408f0c2f45198cabdf625cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous embedded URLs pointing to external domains, indicating a likely phishing or malware distribution scheme. The PDF structure and embedded content suggest it acts as a lure to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=advantages+of+time+sample+observation PDF link annotation
    • http://dmkert.hu/files/file/73788560212.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/vezix.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090910081988.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/75531574380.pdfIn PDF document text
    • http://vuason.vn/upload/files/7114238432.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/gabebijuzezitixidafabemav.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/65674280335.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613158f53860f---dubirubiwufegusivevimen.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/migijoxifasawitapegilo.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/11936794986.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/81278449052.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/27823339209.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/48617994002.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/7212981337.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/16445313254.pdfIn PDF document text
    • http://fitviewer.info/files/file/41897588962.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/fisunom.pdfIn PDF document text
    • http://travellerisland.com/files/44583735397.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/pikibarimezodum.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/zeromiviwupozaket.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/smgb1u9ehb0ugrjlbuhvp0vcbq/29132202939.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/75379897860.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_off00010d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12579 17084 bytes
SHA-256: c5e37d6522536c1462511ff8d2202c49d08645e7bba1c09f6d260e291230104f
font_02_sfnt_off00015139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15139 11028 bytes
SHA-256: 1d0675074ff58031606887c103a4214e9725ff708d39a2bb663b9c10e0c32427

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