Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab8f577dfa2372b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 04:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f7613b3a665be700d989100d74518d1e SHA-1: 10faac3029f6c3cf672b08cfb574fc60ea226f9e SHA-256: aab8f577dfa2372b8c8e5a7f494ac88dfaf41c749be94f247663e4fc800d5bb3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=crazy+car+racing+mod+apk PDF link annotation
    • https://florerialafloresta.com/ckfinder/userfiles/files/34557278142.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/67740925753.pdfIn PDF document text
    • http://corkpotters.com/images/53810026352.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/88733602164.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/51618910926.pdfIn PDF document text
    • http://citranco.com/users/files/16282245442.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/nipasulexaloxe.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/medokilatemezu.pdfIn PDF document text
    • http://jfe.hk/userfiles/2054023834.pdfIn PDF document text
    • http://talleresjpg.es/img/file/4101304580.pdfIn PDF document text
    • http://geodez.com/pliki/file/mifojelofipaluwejodo.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/63893022160.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc98de4843---zigitaxetebapurawe.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/borererezewajojoxokoguri.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/woxegujujikulalokosu.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/96859089424.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/60450252598.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/deruwitujinireveg.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/lolidilanawasitezatujupoz.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/kidobujivimovidim.pdfIn PDF document text
    • http://adveotec.com/img/file/juvebuwarepisom.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/rapuvejipepodikadoj.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/60634289421.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/gemibazutobiwafepimit.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/libabumunilebimij.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_off0000e46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46B 10712 bytes
SHA-256: b371f623558452424b14b5d2c955576abbb4df22fdd62f7a9ab56554f3efdf97
font_01_sfnt_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 16740 bytes
SHA-256: 024310efe6ba503a71ddc2f2b0c40fed5a97cbae057fd7240ffab861bbf62235
font_02_sfnt_off00012889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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