Malicious PDF — malware analysis report

Static analysis result for SHA-256 143b191f4e11ba3c…

MALICIOUS

PDF

69.8 KB Created: 2021-09-09 11:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9245df1b624cd28c2964063c1cdaa315 SHA-1: e9e0b179596056a714052329033a89ce6079ffb5 SHA-256: 143b191f4e11ba3c92bea4f7b7ee940105890589114cdfa8cf3d81a7329091e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=shell+shockers+io+games+zone PDF link annotation
    • https://floridagreatescape.com/media/file/mopanoforivugosiza.pdfIn PDF document text
    • http://zimmerei-possert.at/55406295912.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/39589822391.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/pomitesowevupuweludobobo.pdfIn PDF document text
    • http://acril.ru/ufiles/files/56469246188.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/17013079971.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/47867015184.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/bosefifurijaxebikow.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/81082817127.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383a2208956---43052032402.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/66614124160.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/56833024702.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f265c8548---46541282809.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/begaxogoj.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/bureminosupejewo.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/zexasudogewedaw.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/movabenomipamidu.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/totokitipupaxutedumenemof.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/93388637802.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/finudimefaduruniredubid.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/55100277237.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/95245660032.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/fevikavalelon.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/14670832811.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_off0000b348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB348 14872 bytes
SHA-256: 42dbbed811a11363ecb6f3e54f18bf819e702e0068a2201d6af9d406469c6481
font_01_sfnt_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 10804 bytes
SHA-256: 852e9b1251f73887711e02cd2f3bae9b653a46a09ee5e1f31e05f6466a9d3dbb
font_02_sfnt_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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