Malicious PDF — malware analysis report

Static analysis result for SHA-256 6864b1f461a2f051…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 11:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 49a1d5d22a70fa9ffbab13f03bd4179f SHA-1: 062b7183f887aba10bb61ec7edc52e241f3c90b1 SHA-256: 6864b1f461a2f0512599ccbe27297e9e5881c0f0921df07c5b81c62409bde6d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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=johnny+english+hot PDF link annotation
    • http://zhouzhuanx.com/v15/Upload/file/202199203633404.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/89775076410.pdfIn PDF document text
    • http://sieuthibds.net/images/files/84386569073.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/zazafidu.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/30535332584.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/paxamivaxabobulosodul.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/texomixabakeraretivu.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16141935bba62c---88608070637.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/52584807684.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614612d2d5905---21889868326.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/46019236259.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/94653948620.pdfIn PDF document text
    • http://vipdiler.ru/files/file/82848909320.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/35595507397.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/noxajelatikalapavotafi.pdfIn PDF document text
    • http://cartopack.com/Images/file/roxowumupevusado.pdfIn PDF document text
    • http://sdes.in/uploads/kurivuwijexotuwaf.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/gasumupunukeworufogek.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/96706931327.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/43433310581.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/luvibolazubari.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_off0000d721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD721 19096 bytes
SHA-256: 51614aa13685526951e8583c37e5d8b6e8c8f79ed9db4a24f7affe6dd6a80cc7
font_01_sfnt_off00010847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10847 10228 bytes
SHA-256: c495ece47ce5c2593e41371d0ae6c0b66a406425a8b318c907820ed684f47b69
font_02_sfnt_off00011f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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