Malicious PDF — malware analysis report

Static analysis result for SHA-256 402ff92f6750593e…

MALICIOUS

PDF

74.4 KB Created: 2021-09-23 18:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3c3b7075508b7b053a668e3a9a73ee1d SHA-1: d540dafe61d95bd8e1f396260179a670091deff6 SHA-256: 402ff92f6750593e10d55acb9360d8ac15eb906f027cf12bd85b79bfc0674511
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to external websites, suggesting it functions as a lure or redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of using disposable hosting for link farms. While no scripts were explicitly extracted, the presence of external URIs and the ML classification suggest potential for JavaScript execution or other exploit vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=best+javascript+pdf PDF link annotation
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/rafewef.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/gizoxulupakinefab.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/pazuvutatefotirefuve.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/lizulefiwubodejudewuromof.pdfIn PDF document text
    • http://willbramephotography.com/desimakodetilorururoj.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/22010895581.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/87240287736.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/85617479050.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/26186587148.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/dosolufaj.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/nowirupif.pdfIn PDF document text
    • https://ghnservizi.com/file/vudiwafifugenane.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/nowusonebawilakeke.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429b697c3fe---80031393839.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/20960864662.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161408c13368c2---xekilunusibesuximagaroda.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/lopukewodosukukutadusano.pdfIn PDF document text
    • http://foxhill101.com/userimages/68018042577.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/xiriduvapejigifogob.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/gejedubekukosel.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/xijizekerikotake.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/83972257879.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/gukisib.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_off0000c16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16C 16536 bytes
SHA-256: d2f47dc803c4a2f9ea2f81810f2db77e84eb07dd387a7d75fbcea3be19018f53
font_01_sfnt_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 10592 bytes
SHA-256: 8e544ce9e89d0d2c10315b84061d343caf43345a2a4159debe68ce4f3fb19c63
font_02_sfnt_off00010476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1