Malicious PDF — malware analysis report

Static analysis result for SHA-256 03500e1f68ba7118…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 16:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8eb90403ad86cb215410c6eaee0f03ef SHA-1: 608043af24e0c125d0fe59b45222bb5067630fe9 SHA-256: 03500e1f68ba7118c22bc2c6a1cffdb277c7e6c218d74c2ae3f32bd1ee8cf9b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

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://chcial.ru/uplcv?utm_term=jism+2+streaming PDF link annotation
    • http://songhandiban.com/uploadfile/file/2021091623482973499.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/fefixugejalel.pdfIn PDF document text
    • http://airsoft1.ro/files/file/6757863549.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/5277078789.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/jiretadanumula.pdfIn PDF document text
    • https://ip-pharma.net/data/files/kizunosegibanajafar.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/il0b756pvisrqoflmln0d7v297/86686318778.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/zujogovutekapijuxufili.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/xagexod.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/57584538116.pdfIn PDF document text
    • http://hbaoge.com/upload/files/61238460040.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/biloribexezenisat.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/96525190486.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613770b6de492---pefugometal.pdfIn PDF document text
    • https://pisausakti.com/contents/files/rejevilapob.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/videsoseturalitip.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/beberasura.pdfIn PDF document text
    • http://heizler.hu/files/file/zilumuxuvuti.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210906232130.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/68320881233.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/kugimipewesabefum.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/73701097715.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/xufexowazopeledo.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/lirufufosoxexeweretov.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_off0000bcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 19300 bytes
SHA-256: ef1d047559a91cae4dd8f29e9b453a96e10208c00961bf1a42cae44615e7b039
font_02_sfnt_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 10396 bytes
SHA-256: f114caace1fb4f005ac48320080e79f0a48ab6fa3172ee37b7add85f8b8492be