Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9157c0d661dae6e…

MALICIOUS

PDF

68.0 KB Created: 2021-09-26 10:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 178cbae2080e243eb8b1607f51bc968f SHA-1: c81fa15dda78db2edbc604e272492eecea1f198f SHA-256: c9157c0d661dae6e2172ba586cf350314f300394e8e6cac0e7c61f4bf0f21dc5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://tycoonmedical.com/userfiles/file/88497714805.pdf In PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/31196012575.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/37190c151d3f3b967ef7eb245f5eaed7/safovudabujefobo.pdfIn PDF document text
    • http://blccy.com/userfiles/files/xakiwotowabitudegigekezat.pdfIn PDF document text
    • http://kodemari.info/data/files/fujokuvalekopopabegepid.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/67682359647.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/82111942701.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/wirelupezopena.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/27991395577.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/lunezesipe.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/zonunibibetidomibaso.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/fikaxesorozobavik.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614170f054f6b---44744939487.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/vorosamu.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/46013969707.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/wawagomezapulebopa.pdfIn PDF document text
    • http://araratmebel.ru/img/file/lisubutadusinob.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/40097040436.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/44961137189.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/40344116329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=chronicles+of+narnia+the+lion+the+witch+and+the+wardrobe+watch+onlinePDF 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_off0000ab4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC363 10832 bytes
SHA-256: 73dccb417b7f74e036455c159139b5cd7f65d4a8deba1c8d9663ee2666b4d512
font_02_sfnt_off0000dc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 15332 bytes
SHA-256: c64bee7c3c4cad4f824088fda9dc0ab3542f8760508e69f37d4946545f3cf7be