Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf560a8ec48f949a…

MALICIOUS

PDF

77.0 KB Created: 2021-09-19 12:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d622aea480f149f3b621cf145d4271b SHA-1: 425d3b02daba45069d95b4144eca2b494360ea28 SHA-256: bf560a8ec48f949a74ed8b5c5622f653bb267a37ac8eadef04b0f1b51e235793
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior, suggesting the document's primary purpose is to drive traffic to malicious or spam sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 4

  • 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://pixomot.ru/uplcv?utm_term=ap+physics+c+electricity+and+magnetism+study+guide+pdf PDF link annotation
    • http://alfavs.eu/userfiles/file/25191774090.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/75443375422.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/geluxofokef.pdfIn PDF document text
    • https://e-room.co/userfiles/file/47514315732.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/69623177335.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/29464743844.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/sewefezuxojozeboreriwiba.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1b1145bd---bazunato.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/deletijujiluwamujog.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/74715204449.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210902205805_871046454.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/mojopilunokuzegevo.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/56234066384.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/matijafad.pdfIn PDF document text
    • http://cascad-trans.ru/files/19350399602.pdfIn PDF document text
    • http://contelex.it/userfiles/files/meburuzumaguwi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c039c54acd---vivomirimopuxesonaketonu.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/gefuxisolokewilejubegura.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/vevuvejonunewitobatidapag.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/fubezogoki.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/57410007071.pdfIn PDF document text
    • http://amkchem.com/upload/files/rubosivajidoxumobis.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/gitozo.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_off0000c609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC609 11144 bytes
SHA-256: 1ef184975e60041e9c2944f0227d89475ea64343b416577347c328d7097e50e2
font_01_sfnt_off0000dfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 17740 bytes
SHA-256: 2417d7289c53ba8209429d5fd6dc51fb6c8b953ebe31d89685bfb42e15b3bdb0

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