Malicious PDF — malware analysis report

Static analysis result for SHA-256 5342771c0c738044…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 05:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 742566d70e531423913286eb1bb710cb SHA-1: 21500a539149044f308a5f5fab45e448751883ab SHA-256: 5342771c0c7380447064f3e05c86747efd500d7e8b72092ce5ba81b1f8799134
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the ClamAV detection ('Pdf.Phishing.Trojan') point towards a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=tv+streamz+apk PDF link annotation
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/91344854247.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/sodadesepaxufugozigere.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/palok.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/zefejuziloleboges.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/28881886175.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/19123036998.pdfIn PDF document text
    • https://go2germany.ru/files/file/momidugipojiriwadegerop.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/ponabase.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/49383162970.pdfIn PDF document text
    • http://storemisr.com/uploads/files/jobarilab.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/mutevasuw.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/9073011001.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/mokajatowikepu.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/gusupevobi.pdfIn PDF document text
    • http://393citizen.com/upload/files/lifil.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_off0000b2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2ED 16956 bytes
SHA-256: f104647c1778bd13ca537a0311595c3f352fc7f99e86017746da7990dcaf3b13
font_01_sfnt_off0000dee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE1 10232 bytes
SHA-256: 585a0f4a4e6847cf1a1992713d5594aae93a5d68e4086be834325f29c1f2ee10
font_02_sfnt_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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