Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3fdf7971f562d2…

MALICIOUS

PDF

101.7 KB Created: 2021-09-17 04:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d7a370ed4f03b675b9dd3f5c5a2c1125 SHA-1: 82918e90f8bacb820c81f5bd62327d7757759e6a SHA-256: dd3fdf7971f562d25eea0ebc0494a731c22dba94e03b791db4176741b1c6d226
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs point towards an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://pistant.ru/uplcv?utm_term=square+root+of+root+5 PDF link annotation
    • http://nhasachthunam.com/upload/files/wotexisedap.pdfIn PDF document text
    • http://caramelitos.sk/files/56284244517.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/pefisesegelukor.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/7682735522.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/pugenuxolevazuduwuxi.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/nawupirewezipizewi.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/rerirowekalojigu.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/pulubije.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210914_7779BB5CD26ACCBA.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/mokuvunivur.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404cbf39afd---84156621298.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/xepofotuxat.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161341ddf72374---vuluxogijidabiragidituj.pdfIn PDF document text
    • http://iltorg.ru/upload/file/sudejijojabefavapubiw.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/25080859253.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/botijosotuditozinuxasasiv.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/71639284636.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/18559203706.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/tovolosagebiravabusore.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/85817014374.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/79076451858.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/telofawagimuneviwuzaji.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/83159333200.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_off0001261e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261E 10252 bytes
SHA-256: 1996ecd1678fdfe4ebd5883e6422e6b632adb70ee69d1b75ff55d5a66710c8c1
font_01_sfnt_off00013d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D63 20088 bytes
SHA-256: 66964aad87b2236665f2526169536afd5ae990cbe4cffb789ffba3553e925c5a
font_02_sfnt_off0001718e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1718E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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