Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a9f060d42fd682…

MALICIOUS

PDF

87.0 KB Created: 2021-09-20 02:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abc69085cdf42979942b35a43f4b29c5 SHA-1: fac525b05550e1e97f3a3d3fa8f1265a6b7e0724 SHA-256: 49a9f060d42fd68250dda062cab4c52c1d8dbf778d0f97243d45610321ba0845
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a link farm detection and an ML classifier. It contains numerous embedded URLs pointing to external PDF files, suggesting a phishing or malware distribution scheme. The ClamAV detection further confirms its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/zosunixepekagopowal.pdf
    • https://seerupit.dk/assens/file/73222622606.pdf
    • https://durgabas.coop.np/ckfinder/userfiles/files/87111378075.pdf
    • http://phrabat.net/UserFiles/File/komenikurubifo.pdf
    • https://lee-trading.tw/archive/upload/files/92836093552.pdf
    • http://alfavit.tv/userfiles/file/tosukokopapipolobizoxi.pdf
    • http://profstil.az/userfiles/file/wirijerojona.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/5v5pptetb36oma6jauur2cnvjt/721608369.pdf
    • http://mayinmaunhat.com/upload/files/44509595490.pdf
    • https://inprovitparaguay.com/ckfinder/userfiles/files/8051979342.pdf
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/xulukizarajuwozova.pdf
    • https://marblo.com/app/webroot/img/files/gidadediren.pdf
    • http://parfumerieindex.nl/images/uploads/27199583652.pdf
    • https://oancora.com/ckfinder/files/pevugozu.pdf
    • https://alsultantrading.ae/userfiles/files/patopemoxutuduguwet.pdf
    • http://club-integra.ru/userfiles/file/misivelew.pdf
    • http://vigova.vn/Images_upload/files/nugidelapadirife.pdf
    • https://vilus.cz/userfiles/file/pimijonejenarazufer.pdf
    • http://augustaelectricalwork.com/editorData/file/45572353108.pdf
    • http://artattack-concerts.de/files/file/40722642695.pdf
    • http://gleb777.com/fck_upload/file/tazabekobovigunadoxak.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f750c033f9---22017584988.pdf
    • http://webinaris.eu/ckfinder/userfiles/publics/files/paraxezosewaveferad.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=redmi+note+9+pro+max+vs+poco+x3+nfc
    • 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_off0000e79b.bin
2d6f5dbb9aab21b881fa299987cf111d009ae73d05d8185fff9bcfd7ec5f3ae9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE79B 11288 bytes
font_01_sfnt_off00010232.bin
b0bf5f348940957622393818b1dccfd52d4ce669dcf5919cb213692a7d81ab60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 19500 bytes
font_02_sfnt_off000135cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135CC 16792 bytes

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