Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9205c801b768bb9…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 09:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 716d76f84e403318bc799701a37db41d SHA-1: e86f5a0bff008d3bcea4d17b766a9679a008b5f2 SHA-256: a9205c801b768bb9756927accf166cc70e4fbc3d87778423051243bad2ad816c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=guitar+apk+mod PDF link annotation
    • http://bhk-aindling.de/userfiles/files/gikepariwelufaze.pdfIn PDF document text
    • http://eternaseguros.net/files/files/kukadesesarodijefasodan.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/xugojemekufalevamus.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/zunomixojezilofaxunarize.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/bodapidajowod.pdfIn PDF document text
    • http://velisend.ru/photos/file/lemasarutubawetalibe.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/57777825979.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/47439486541.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/38976170784.pdfIn PDF document text
    • http://poliinc.com/upload/files/laxixewegizumigirogu.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/lijitotetenitor.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/korogir.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/xirokesekuzugasixizut.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/dadamasewud.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/2245902443.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/kigutipem.pdfIn PDF document text
    • https://renewone.de/files/rogaroxewalebogodas.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/84762243140.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/11314254982.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/zudotuwamenizaferoj.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/76370746768.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341883e8bef---pomigazutoj.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/zamatavamawobuduwug.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/zokuwosagegofile.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/nixazepasizurobitasasida.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_off0000d7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A1 17284 bytes
SHA-256: 42c00265308dba49f6473cfe97824cbd61280ab0927571b9faddae1bcf781592
font_01_sfnt_off00010471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 10332 bytes
SHA-256: 515654f26da22b31f185b168369040caf258c0076804cc56a7df5ac42987f2a8
font_02_sfnt_off00011bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1