Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b6c377301a60bc…

MALICIOUS

PDF

78.7 KB Created: 2021-10-11 11:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 218859b988586e484125ef7f3a9167dc SHA-1: 182c4fb748fcb9d9510765d396374c6192774192 SHA-256: 39b6c377301a60bc489b4c19ff55c30be24ac91cfd32af6b27f30664d3119d71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on various domains, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/62188811305.pdf In PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/56228927705.pdfIn PDF document text
    • http://domainecomps.com/documents/files/fopeferajirilefamugeko.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/dadoza.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20211007033630510.pdfIn PDF document text
    • http://adice-area.com/pictures/files/xudejuda.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160198dd8ff4---90214163533.pdfIn PDF document text
    • http://khamranghaiphong.com/upload/files/lomosixakup.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/24833887453.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/rozumilikotonasidopapi.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/59952363079.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/40655566950.pdfIn PDF document text
    • https://ivanamihic.com/files/luwakizulusow.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///rodowebuvobunexugila.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/lovaderiwuzubemibije.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/68183211797.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/zixusi.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/90261023987.pdfIn PDF document text
    • http://hejia-ele.net/upload/fegekajuxulorozotivabofa.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/10356370672.pdfIn PDF document text
    • http://otczenacts.com/media/files/71097015650.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/xumuxugozewesepesikud.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/8796323771.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RhDyTiV0TgQ/uplcv?utm_term=mewing+face+exercisePDF link annotation
    • 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_off0000cdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC2 10428 bytes
SHA-256: bb5ad79ee14f608f5f6586282c783c82cbb8520b3e8cad349d399719ab37576c
font_01_sfnt_off0000e595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 18492 bytes
SHA-256: d33669d60073755d42e8aa4fedfd21dcfc0e336e90e98d79f5903bc275dcd881
font_02_sfnt_off00011553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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