Malicious PDF — malware analysis report

Static analysis result for SHA-256 9550f2005e3799ff…

MALICIOUS

PDF

71.0 KB Created: 2021-09-21 11:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 23a4ad3f3a9fd0e28ce7c88ff00313b2 SHA-1: caa41fcff182441a58a7479a95aefab8bf0e01fb SHA-256: 9550f2005e3799ff3daf45ee1970737c33a6f50e19b97e8557174906998e7114
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for distributing malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=subway+surfers+cheats+app+free+download PDF link annotation
    • http://realcomfort.ru/content/upload/file/45429395412.pdfIn PDF document text
    • https://renetravel.ro/images/files/36381704501.pdfIn PDF document text
    • https://dellrein.ru/content/file/javuke.pdfIn PDF document text
    • https://labelmarket.pl/data/file/68238406276.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/8005198542.pdfIn PDF document text
    • https://yodobashi-church.com/64957152245.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/52400342054.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/91593843690.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e2908aac268c66c8bdd2262d00ea8590/20205700252.pdfIn PDF document text
    • https://value.ae/userfiles/file/lozajufugujolobo.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/pelepodatusot.pdfIn PDF document text
    • http://eva.am/files/7ac0fdbd0580c5e6.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109180652156834.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/vojupumevosopew.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b740b7c95---47588244298.pdfIn PDF document text
    • http://eichler-kammerer.de/82441012653.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/xexona.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/26838959969.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/gosez.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/wuropisodama.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/gizediziwefam.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_off0000b47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47F 15896 bytes
SHA-256: 418e7be94be4e2700caee4de5de29e78a1296fc97af5665ce29a82ef05104401
font_01_sfnt_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 11140 bytes
SHA-256: 8ed44241f81a5195924d7f4bb56db89bdf76590069c418caf0d4d85628458467

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