Malicious PDF — malware analysis report

Static analysis result for SHA-256 7311f3176a4f9103…

MALICIOUS

PDF

68.4 KB Created: 2021-09-27 03:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 10cec429e8055de6a092caaf39e457bb SHA-1: ecc144ff10137302ac0ac6b99dadc5c6edcdde51 SHA-256: 7311f3176a4f9103bdef48c171cf1026a35a6f6905bdefd3efcd4a8c9ed10fcf
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing clickable external URIs. Heuristics indicate it's a link farm on disposable hosting, suggesting a redirection to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a spearphishing attachment to deliver a payload via one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 2 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://huntic.ru/uplcv?utm_term=truck+evolution+offroad+2 PDF link annotation
    • http://avstralianature.ru/ckfinder/userfiles/files/62130294431.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/roronamigi.pdfIn PDF document text
    • http://gtshotel.it/images/file/14459596712.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/favufa.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/doposejubaxemojemored.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/59665752605.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/58660706114.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/37895512511.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/95352784545.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/17676858669.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mkcjeu161ba24fikkaqg9ur307/sabomikenixiwuwumazixerav.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/51247477858.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/rijuvuwujo.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/kikekowumuseweromajexures.pdfIn PDF document text
    • http://vanhacollection.com/images/files/jipavaworuxuboweneg.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/3308237888.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/demuze.pdfIn PDF document text
    • https://cncunse.com/d/files/fokigonov.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/18204824726.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/wadixejizadudov.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/13856091008.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/kojakup.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/41285870929.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/84309203884.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_off0000af27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF27 14484 bytes
SHA-256: 252c0e95274ce9375cdd28641e9265949f440db5e0d40f6d30d39e6a83780b1e
font_01_sfnt_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 10644 bytes
SHA-256: 449c09e245149274e6a486ec319a59bddabb2b65bed218bd0051c2a5c0d22015