Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7c55199d0aafd7…

MALICIOUS

PDF

68.5 KB Created: 2021-10-01 14:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 656a0f888fa0455805be47f29b8a0932 SHA-1: 6ce7cb67e6f8d51bc5ead2081177f0777c82f2ec SHA-256: 9f7c55199d0aafd7a9dff8ad1f8fa8b85bcac433dcda041681d61c6a47f10b57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://myreply.mobi/snappshott/editor//file/vavubijazu.pdf In PDF document text
    • http://foodzipo.com/uploads/userfiles/files/21520843818.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/76338746730.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/kemimijuxeropebusid.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/39444115285.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/36556005564.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/jizuvadasuwejitufuzoxum.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/togaxobaniputoforiga.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/patesu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jou9njgb85bug0c8psq88tk396/wotadek.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/66923247120.pdfIn PDF document text
    • http://finchamauto.com/pics/97313022059.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090511832_456152400.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/siwawaxuk.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/tikisinuzowaki.pdfIn PDF document text
    • https://krossi.ru/images/content/files/lipoberexepo.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/8106986261.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/55294858094.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/bowudidegag.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/tinuf.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/48408529649.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/77421487526.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210902221824312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mobile+legends+bang+bang+hayabusaPDF 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_off0000ad68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD68 14768 bytes
SHA-256: 855209b5fb6798c4669c39daa0f7639d0c68630589d597d77648eba737b9bddc
font_01_sfnt_off0000d23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23A 10676 bytes
SHA-256: bba103055c352960cb924611af49823de66a07f0f4d82f74b2c5050111de46aa
font_02_sfnt_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1