Malicious PDF — malware analysis report

Static analysis result for SHA-256 8142fa8535cafa11…

MALICIOUS

PDF

88.5 KB Created: 2021-10-09 08:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4513ef95eec15d1dd5f87aa28fe4d5ae SHA-1: 8d3d3b23aba4ea6e2643626ff003e75078cbe292 SHA-256: 8142fa8535cafa1178ac27efa78b88cf3cbdd63d1accba12e24f7dd48ea51696
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm configuration, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm structure points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/uplcv?utm_term=assassin%27s+creed+odyssey+pallas+the+silencer PDF link annotation
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/80101107515.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/kapokufit.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/pixumataxigo.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/levaguzas.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/11622713370.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/gozuvebibekelotoremifog.pdfIn PDF document text
    • https://baptistfriends.org/media/67527330394.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/33388154711.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/wikaworagadiselu.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/83753072848.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/begunowemotupilinu.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/nidedamelu.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/49507173213.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/49169037951.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/70067942621.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/41275844791.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/rirotojamugexavaf.pdfIn PDF document text
    • https://preciseenergygroup.com/media/99585239935.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/pexonexedizanulidexowa.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a6101dac2200b84e3477a35eb889f69c/jepul.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/10746631125.pdfIn PDF document text
    • https://cosmetic.dilen.top/upload/files/96732913129.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/33702640900.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/gebobowakesas.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_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 10740 bytes
SHA-256: 0ed4eecbb4305eb4921f857d3568758a5f154482602f013e2be17fb12be42583
font_01_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 19916 bytes
SHA-256: bb508e4944e4d95f10cb6a4330850f6ad538764af18ceae655d51d3d67a9b871
font_02_sfnt_off00013bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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