Malicious PDF — malware analysis report

Static analysis result for SHA-256 86edc73482055c30…

MALICIOUS

PDF

72.5 KB Created: 2021-09-19 21:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db3bfe397131a8590f8b803fbe49c08a SHA-1: 4cd6a2a0684cfc9171904e4d0a45338b7ec94f34 SHA-256: 86edc73482055c30ed3a23fad8f3d8a41eb6d6963354943f246a61ef97520dc9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The PDF structure and embedded links suggest an attempt to deliver a phishing or malware payload, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://markzone.az/wp-content/plugins/super-forms/uploads/php/files/8ti2l832ndufih799m8jbjnu05/warasufip.pdf
    • https://imagebrandstudio.com/userfiles/file/65661807976.pdf
    • http://hzqljsj.com/images/upload/File/kukawabagerasagamifu.pdf
    • https://digireg.org/upload/37434747329.pdf
    • http://novehorizonty.sk/userfiles/file/53223601050.pdf
    • http://gulfcoastlist.com/userfiles/file/tifipenetapewilotabube.pdf
    • http://av-jet.ru/userfiles/file/vewodinomasukebitosarobu.pdf
    • http://biogenetec.tw/image/files/20210907_005119.pdf
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/32726465368.pdf
    • https://smartech.lv/sites/smartech/uploads/documents/files/sutaji.pdf
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/7442569128.pdf
    • http://stensoproject.com/userfiles/files/pimabuputedinenide.pdf
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/fofodenavabuwimijul.pdf
    • http://lenosada.sk/editor_uploads/files/venibumuzexot.pdf
    • http://taxicityplus.ru/userfiles/file/81071313967.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161329c6057713---11132267372.pdf
    • http://stringladies.cz/userfiles/17254207601.pdf
    • https://hijaulumut.com/contents/files/zikute.pdf
    • http://stavclearing.ru/upload/files/83272806630.pdf
    • http://danieldesignpro.com/userfiles/97201243997.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/nedeb.pdf
    • http://kavtas.com/images_upload/files/47906978243.pdf
    • https://dakhoathienhoa.net/images/files/daxelesonerowisos.pdf
    • http://www.de.ruben.pl/ckfinder/userfiles/files/revekujupuxitopa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=video+mp3+cutter+app
    • 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_off0000bc18.bin
5684e145943673bf016cd71291e7df1084557ab69e91f71c3b812c1f21f14ece		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC18 10596 bytes
font_01_sfnt_off0000d456.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD456 16792 bytes
font_02_sfnt_off0000ec68.bin
50d1c91d28da3c7ae3b29403c55c52b429f9138a1028423ca60cdba5c66262aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 15648 bytes

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