Malicious PDF — malware analysis report

Static analysis result for SHA-256 de72f16d69bc4e9e…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 01:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 087a0a4c14c8aa0f5f50af8183410825 SHA-1: ccf9c371e407ea51152f7ca7925200c3751144d0 SHA-256: de72f16d69bc4e9e45a6c0d22a3f30599010c28672de6265c9097c9b01453ac7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF exhibits characteristics of a phishing lure, including being image-only with a click-outward action and a small file size. Heuristics indicate it functions as a link farm on disposable hosting, directing users to various PDF files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate the download of a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 69 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 http://tavio.su/files/file/xojagozutazo.pdf In PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/daxofanagiban.pdfIn PDF document text
    • http://freestyler.cz/img/file/99162442238.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/beroja.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/90580671259.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/vomurosemumezonug.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/balufofitusedujifunokuge.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/serexer.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/sawikivimagijegilusakapo.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/rowimube.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/jizomajitejiwudafuda.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/nesofawowujigotefijev.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/kojoremikez.pdfIn PDF document text
    • https://kuwaitpolyurethane.com/ckfinder/userfiles/files/jipejibowe.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/kopozitaxanokejugegavikil.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/22094786336.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/70458446387.pdfIn PDF document text
    • http://sudeoksa.org/userfiles/file/20210921154814.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/6f5939bbc7320b5c8f4de67e59e1b2a3/94612482562.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130b5f9a72e6---84840481967.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/73867837031.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/wumopobamojaxokomaran.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/33441942707.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/fevosumunaxunomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=kissing+my+sister+full+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_off0000af21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC738 11140 bytes
SHA-256: fb4e228db24261e3a783ee75d5f443e858b9f96f1dc1fcb2ac3e3dc4bf3aff9c
font_02_sfnt_off0000e11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11D 14356 bytes
SHA-256: 41da8abfc696bbe4ecdfc860b3f2c2a6e08414480e464a445956ccc71cc426c6