Malicious PDF — malware analysis report

Static analysis result for SHA-256 3288b464098e2360…

MALICIOUS

PDF

68.2 KB Created: 2021-09-16 08:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7e1d511c4bdc9bd7feef5262031d7e5a SHA-1: 88d8c21191a72806445444c18333ec78dbb6d294 SHA-256: 3288b464098e2360ccc5b167306b8f89b49340b97dc0d3444d98395e67487a8a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and a prominent link to an external URL. The heuristic PDF_IMAGE_LURE indicates a screenshot lure, and PDF_RANDOM_URL_LINK points to a suspicious URL that likely serves the malicious payload. The ML classifier and ClamAV detection strongly support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://rmp-traueranzeigen.de/cms/files/wovedajigimuxokev.pdf In PDF document text
    • http://mdsalon.ru/img/lib/file/51752196273.pdfIn PDF document text
    • http://prograsifkalip.com/files/85890309588.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631330195.pdfIn PDF document text
    • http://dakov.hu/_user/file/7066600763.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/nopotofomojen.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/gosedat.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/kogudoxorexof.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/63996254213.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/13747590353.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/nevagakufu.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/11848074163.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332c354d876---kofazidev.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109131706519928.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/28313384230.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/749387193613dfccb5523c.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/gixoxexojetoze.pdfIn PDF document text
    • https://ags-car.com/upload/files/gebixur.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/zozovadosebisuduneben.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/71294418489.pdfIn PDF document text
    • https://soechi.net/userfiles/file/kobulabodavazozifa.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/japetikusevubusonevo.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136ddc2287c6---fomedobabuliwipavonuwomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=korean+curse+words+in+dramaPDF 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_off0000afb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB2 10564 bytes
SHA-256: 64c63ef7c4ea6490d9370ff97dafe7d9f606b9d32ef286c885879a6313778d26
font_01_sfnt_off0000c7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C8 13628 bytes
SHA-256: 37a306dd4bf0f56580849fae4488389b84342adc45ed71ecceb9150c29e007de
font_02_sfnt_off0000e93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1