Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0b7142abed7a24…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 06:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c2b4228ce5999c0b3da756c96809c29 SHA-1: 62a90cddea22688d9dfb2ce5f4652a1122403a3b SHA-256: df0b7142abed7a244238a87f01f10b8011cfed013b7f5bc42cf88fd2b3903cb0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. This strongly suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cructi.ru/uplcv?utm_term=best+alternative+to+outlook+for+android PDF link annotation
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/99522649847.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/tasetizovipuwepadolabupo.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/konemesurovidabexejizum.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f36ec221cf---618307148.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/tifebivosifarekabijigud.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/subifezoraserer.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/xusuzuwekomaliretu.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210914164646.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/vuvufiruja.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/detepalopumenunaz.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/fidofopixasewebo.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/84207037422.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/32183093849.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/taxodabijatafusad.pdfIn PDF document text
    • https://znalac.com/userfiles/file/24044858813.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/19629462131.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/vazilujojarubowavu.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/pekexaruvotu.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/65747148146.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/xufin.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/sawaxiwawovukozomowuf.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_off0000d8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 10656 bytes
SHA-256: f574bf516b92c6d38659d964348e3cdbfb34614f0307bef674086c7455aa3f16
font_02_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 18056 bytes
SHA-256: dded22d3b9ac82b9afde8b78a4139c127dc3f368ace2e5dc0d472611cf04445c

Open this report in the interactive analyzer, or submit your own file for analysis.