Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7b3b5937b63938…

MALICIOUS

PDF

77.7 KB Created: 2021-09-12 02:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5f7717bc97df81e807ae69e07b2896e SHA-1: 1fdde3ddd7c92bf3baa12d30f2d55370f7c35388 SHA-256: dd7b3b5937b63938d9c3bdb42047778dd1488d33e4ef2c08fc46c01d0145ec35
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.natursany.com/ckfinder/userfiles/files/15167003190.pdf
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/64822910129.pdf
    • http://myshiou.com/uploads/files/202109100406558651.pdf
    • https://terrebleue.org/userfiles/file/88900158921.pdf
    • http://1yunnan.com/ckfinder/userfiles/files/79286917715.pdf
    • https://rireenfrance.com/images/upload/files/polilukemisajoxamegujig.pdf
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/27217382496.pdf
    • http://hakasasi.id/userfiles/file/1236294055.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613012327ee68---99455991059.pdf
    • https://undergroundtakeout.com/userfiles/file/85062501747.pdf
    • http://eiak.org/upload/editor/files/mokopupotojovezipikig.pdf
    • https://bahispesinde.com/gnc/veri/_files/xoxizemomenarako.pdf
    • http://meteosputnik.ru/userfiles/file/xarenotamigimitatam.pdf
    • http://liyangah.com/Upload/file/zasejogagulikob.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139b3903083c---dakapun.pdf
    • http://scpt.it/userfiles/files/jewepewi.pdf
    • https://adikkeempat.com/contents/files/takafefasawisodenigi.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/najovafoxex.pdf
    • https://gulceoyunlar.com/calisma2/files/uploads/45597997211.pdf
    • http://bantinnhadat.com/users/files/tuxefofujetuxuwaxe.pdf
    • https://lesrimaudieres.com/images/uploads/file/94921698207.pdf
    • http://wxeina.com/userfiles/files/jetapuxawerusaravupaja.pdf
    • http://aj-freight.com/ckfinder/userfiles/files/81383659048.pdf
    • https://jmclimatizacionhvac.cl/images/subidas/file/vusuxutirixupog.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=harry+potter+order+of+the+phoenix+pdf
    • 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_off0000cd3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3F 16792 bytes
font_01_sfnt_off0000e551.bin
03738b91760dbb516ccd3d327051a30a08f9a4f6ee0732389fbbbce3c34bee96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 17092 bytes
font_02_sfnt_off00011128.bin
9c8a21dad1a7902cda64e96936de9cdfa897fba63d63be818e9ef79f629167c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11128 10588 bytes

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