Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8e05143995cb18…

MALICIOUS

PDF

71.2 KB Created: 2021-09-21 04:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50f8fad1575279c370a34b1b7d3ae1fe SHA-1: 1eedc319fcc53d5da3976682f85bd5543fa37f50 SHA-256: 7f8e05143995cb1889472cec1ece2b4ffe98a2b65e3b52fbbae3bed07822a890
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the presence of many external links suggests the PDF's primary function is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=how+to+transfer+data+between+pixel+phones
    • http://www.deep2001.com/images/library/File/61298596654.pdf
    • https://dejavuruse.com/userfiles/file/13634510446.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fk5g4squinogvlttrg04d8srl5/39080313607.pdf
    • http://mydreamtuscanwedding.com/editor_up/89662928866.pdf
    • http://usateatop.com/_upload/files/90353340486.pdf
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/zaritazajatubinepisalivum.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/sojefinamedipidurozu.pdf
    • https://zibarajabi.com/cache/fck_files/file/ronatewukozebololopel.pdf
    • http://texinpack.com/uploadfile/file///2021090206483198.pdf
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/86381416412.pdf
    • http://dfwsedan.com/nbloom/fckuploads/file/77857534548.pdf
    • http://madinagirls.com/easydo%20v2.00/files/uploads/rarodi.pdf
    • http://nandishoverseas.com/UserFiles/File/81149160111.pdf
    • http://ozhelalikram.de/resimler/files/zepopubirawe.pdf
    • http://mulroyenvironmental.ie/userfiles/file/67234785382.pdf
    • https://truckforceone.eu/upload/editor/file/jipejidaxeni.pdf
    • http://floral-design-lindgens.de/userfiles/file/9090695790.pdf
    • http://wangguanhardware.com/userfiles/file/72474983969.pdf
    • http://101eyewear.com/luutru/files/tolasezapabomuluxago.pdf
    • https://baglab.pl/galeria/file/lowedagodemijojida.pdf
    • https://e-ssuances.com/ckfinder/userfiles/files/kekew.pdf
    • http://casms.org/atts/news-files/file/97235284941.pdf
    • http://pobierzplik.pl/uploads/files/53041503683.pdf
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/gujufu.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_off0000b41a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB41A 16792 bytes
font_01_sfnt_off0000cc31.bin
10b945e7ee9d8cb8374f680a7f50804bb2cbc647e0e65605258bdaceed17d1a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC31 10912 bytes
font_02_sfnt_off0000e52a.bin
5b7f0fc290519d6961801faf1d1617df1ae70298770aa1fe649715a4b7607466		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE52A 16672 bytes

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