Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa534fbb4292bc9b…

MALICIOUS

PDF

70.5 KB Created: 2021-09-12 05:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6105093bfcf4464494e36d61ded796d4 SHA-1: a88794194543a4be66a2d7f42c5675c0d81baf12 SHA-256: fa534fbb4292bc9bbd60062ea7ead0edc3056b998407ba275f4b52ceb8e50c86
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to external PDF files. The PDF_URI heuristic specifically flagged an external URI, suggesting the document's purpose is to redirect users to potentially harmful content.

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 http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/35366726520.pdf In PDF document text
    • http://olympicthesportshop.in/uploads/luvilalanoti.pdfIn PDF document text
    • http://4bx.pl/public/file/xeponukosiridegefokewiwog.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/wonowizajejid.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133deee4fdaf---jigajokasukaf.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/nubuvopifezukojofex.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/63747394551.pdfIn PDF document text
    • https://best-label.com/upload/files/98603634155.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/tibotetilukamamu.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/96013080604.pdfIn PDF document text
    • http://showdoimovel.com/files/files/taloganorinavirujopa.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/89120490866.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/7100112721.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/gumoso.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/45109500688.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/ziboti.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/46260113460.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/40372837981.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/27780046380.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/suletupafatudelerajewaf.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8t0jeseah623lnmd2eknspubco/79754959135.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/40441335145.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/15174192749.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/36774683817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+virtual+memoryPDF link annotation
    • 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_off0000b5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F5 10504 bytes
SHA-256: b2bc17ccc892cb1246277cbb09eadcccc3066168065d04c7de201dd6b6670dc8
font_01_sfnt_off0000cdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EA 15008 bytes
SHA-256: a077aa4fc0cee669b29a068143a89300dbef1a014f4398e6108ec04714144fa3

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