Malicious PDF — malware analysis report

Static analysis result for SHA-256 c085dde32a8ec127…

MALICIOUS

PDF

78.6 KB Created: 2021-09-19 02:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0de168ee3a6016cfd79bdf87c230dd1e SHA-1: 13857a69eb9f18ebacc77902540dedf520b396f8 SHA-256: c085dde32a8ec127d7f4efe264d2019740ebf6551499b0a5e06fbb585e44d92f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample 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 point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution scheme. The PDF's structure and the presence of external URIs strongly suggest it's used as a lure to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://philabc.ru/uplcv?utm_term=gta+5+wallpapers+for+android PDF link annotation
    • https://jungleflightchiangmai.com/Uploads/files/wezoziwi.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/59336405533.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/82804774050.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/24920370793.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/e95e8826ad6982ceea348a449972b0d0/16539944650.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/96349953487.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/36003458679.pdfIn PDF document text
    • https://invision.buzyhub.com/files/46165329834.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/29742274957.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/86348604748.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161376dc1de6c3---40099584227.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/zinikufisamufukot.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/kipefonusitorazufopurijun.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/melobikoxuledit.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/zidopixebiribexak.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/tixodiduwozuze.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/tuduzawutukanukawokoxeku.pdfIn PDF document text
    • https://cargobull.cz/res/file/sopapiv.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/74068665142.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/mogebusobekapes.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/wilozisezemoxugoroxelog.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/75255841803.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/wosinelawufule.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/54573030879.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_off0000cbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB1 10748 bytes
SHA-256: f76e7665c9e61d230a2eee8f55fd79107ade458cd426e83f76565620a0bacde1
font_01_sfnt_off0000e4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 18396 bytes
SHA-256: 1017a4cda2c0c1571e498832ec4523ae621980578e9fe0d2a8a046263867e205
font_02_sfnt_off000114f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1