Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6e26b4ef49cb1b…

MALICIOUS

PDF

80.2 KB Created: 2021-09-21 04:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4de0aaff42f801d9d451f9ebfe81a6dd SHA-1: 1c287faa4b290256e23f30f12985df60cdabce93 SHA-256: 9f6e26b4ef49cb1b0aa53ed1ce9e934aed40af097c1555e10b0ace670b9d6098
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, with one heuristic indicating it's a link farm on disposable hosting. The PDF structure and embedded URLs suggest an attempt to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=reptile+room+pdf PDF link annotation
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef2df7555b---padaxilabijaw.pdfIn PDF document text
    • http://aimic.com/userfiles/file/95364087869.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/tejozozexufufefudu.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/nuxesaxajekuna.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/62874365696.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/bamusupogozela.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/rategeretebubopug.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/gemaziwanuratekunalu.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/71744874016.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/81151074266.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/49435198164.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/bazuduxojevatukemapuk.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/remaximidupemaresobozot.pdfIn PDF document text
    • http://nprofit.hk/userfiles/89355821383.pdfIn PDF document text
    • https://network-italia.com/file/lidubapezugafejerisa.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/kisorivupugupabow.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/c9e5e3cdd40b993dd15e8abeab1fa2a0/12326989317.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/xabinomonorum.pdfIn PDF document text
    • https://eventaipei.com/upload/files/82927041708.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/zemeza.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/94698393233.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/xewerupako.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_off0000d576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 18056 bytes
SHA-256: 190137888700e5e84198e401cbe55f3289a2dfd2d039d805607c93673d19cda5
font_02_sfnt_off00011c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6F 10268 bytes
SHA-256: b05f9e4ecb605174f4119889acb7ff67f83e8f4314aeaf0836479946e3d88236

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