Malicious PDF — malware analysis report

Static analysis result for SHA-256 361dfc56e98e4983…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 01:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 303bb89fe44e841f6a5b5434b348730a SHA-1: aa42fa7c8dbb14fedff0349ed736bf5d99ee2bfe SHA-256: 361dfc56e98e49833de5dd708c6fa0c9c5b631b3fefcd845d8894f34db9f5fc5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one specifically pointing to a URL containing 'mod apk', suggesting a lure for potentially unwanted or malicious software. The high ML score and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=road+to+survival+mod+apk PDF link annotation
    • https://oncallanatomist.org/ckfinder/userfiles/files/denakogidiwifebuvufuxutu.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/13105706665.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/gupumakajogatulok.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/60111460614.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/wariwaveziku.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/18239724934.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/76199168827.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161338412e99a4---gonopabe.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/66743686025.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/javulagajog.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/50469113299.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/45321354218.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/muxirubaxa.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/juzomuludonore.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/sogerefifuxoratini.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/2230200931.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/23742961557.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/pasujigida.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/80714049463.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/20009450866.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161342a420de3a---28160785859.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/25830356758.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_off0000d483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD483 16792 bytes
SHA-256: cbea8475e46a5d706eb6d70b1d8117befe544cdf80d9f3b72f8588b63506724c
font_01_sfnt_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 10620 bytes
SHA-256: 13a77726ae3f5936dbc71273ff4f71f65bc1cd9fc0f79d139d2db63a9cfa2c58
font_02_sfnt_off00011853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1