Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c616067bf21a73…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 09:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 869d1d447f319bfb3d5e302b4360dc95 SHA-1: a2dd5b5a5b4ecd653da0306a45d7377075bb79f8 SHA-256: 83c616067bf21a7306186aa5a93d554be1113cd5b5ecb6d2049c9b15bc60f99e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=movies+and+web+series+apk PDF link annotation
    • http://studiopiergentili.it/userfiles/files/muwoborenufuwuriparedoro.pdfIn PDF document text
    • http://pactolous.hu/upload/file/53141954092.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/zarurenelufifel.pdfIn PDF document text
    • http://videocycling.info/files/file/77205073771.pdfIn PDF document text
    • http://enricobarraco.com/files/dobijokivo.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/bigazopowuxo.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/28229174182.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/17587621470.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/fukow.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/45989657612.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/60921098512.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/9374174545.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/wefejufumawiwifiw.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/puvap.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/80591192023.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed73ff0a77---kuvemotoborupapid.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/xipakelisazevex.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e51d6f6a8f65baca5055096622ba1a68/16458065122.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/silesaxokame.pdfIn PDF document text
    • http://pnalog.ru/images/file/62464889498.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/dujabopesenesef.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/bobegebogagaxepawig.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/62430132242.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/fobumimozobufenej.pdfIn PDF document text
    • http://sns.hu/_user/file/vobutirifugep.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_off0000dd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD31 10620 bytes
SHA-256: 304f22f77b334c8d7452cdce5655e01b46d534b740137b76c5ac3b1f18faac45
font_01_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 20228 bytes
SHA-256: 53f5146d37abe671d7f71635dd4bc8b313cc0e178abe7e8b8835002d11653340
font_02_sfnt_off00012a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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