Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e4c70e03898807…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 12:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1a1147af1de02331507fdb590ec701d SHA-1: d83777e682d557d4107f5df907f180ae75325075 SHA-256: 93e4c70e03898807424c9e764fb5ea0acb951ef8dbf2f4926d8174b259bb13e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to external sites, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving external resource redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.bosingels.nl/ckfinder/userfiles/files/bepanusurutun.pdf
    • https://yaofangpeixun.com/upload/files/35821075418.pdf
    • http://fthyhs.com/resource/docContentImg/file/2021-09-13/359d96412487d65fdd0b139b2d4116c3.pdf
    • http://paitoonbox.com/userfiles/files/36023190966.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5a13f2f82---pidefumipuva.pdf
    • http://allineers.morefriendship.com/upload/files/rozofufut.pdf
    • https://siam-royal-view.ru/data/files/74588355295.pdf
    • https://verner.lt/images/files/lomejovivibivavori.pdf
    • https://www.aaptuk.org/ckfinder/userfiles/files/83170596436.pdf
    • https://pmms-online.com/assets/file/feliwogifedofotivagobadi.pdf
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/31418882212.pdf
    • http://wx-test.com/upload/ckimg/files/202109211410398366.pdf
    • https://manhremhoangvan.com/wp-content/uploads/files/90131855436.pdf
    • http://jindi2010.com/uploadfile/files/xonitororazimovopitew.pdf
    • http://faurau.com/luodan/images/userfiles/file/xufovuniforuja.pdf
    • https://12tiga.com/contents/files/2937220782.pdf
    • http://analhospital.net/file/files/48034884261.pdf
    • http://szamosiszerviz.hu/feltoltott/files/jafoberesotodirikovulir.pdf
    • https://nk-sostanj.si/files/file/dupajokusamufawanapubosil.pdf
    • http://kamkmori.cz/ckfinder/userfiles/files/96025667894.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=champion+graphic+novel+read+online+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 16792 bytes
font_01_sfnt_off0000efdd.bin
a884f0e9587d14aa1e06c080f6d69274b9eada66be13054b9e8fe5a95bf0cf73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 17428 bytes
font_02_sfnt_off00011cda.bin
0d432e56ad0ee76ca43e2a720a727145d458fa2253580c3e36a4f9759b7a8b11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 10900 bytes

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