Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6904a2df3882ae2…

MALICIOUS

PDF

70.7 KB Created: 2021-09-09 10:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 03d9113eb6da773226e2a0ea0f3603f0 SHA-1: 3d2fdf3f129a8848b994ddf00dabc0aebd9e2236 SHA-256: c6904a2df3882ae2541b60d09d94a251dee5d48fbf40c16fa980f335fb8ee675
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs are consistent with techniques used to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://krisoc.ru/uplcv?utm_term=change+buttons+android PDF link annotation
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/dozamaxifuj.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/rudamuxosixivaxo.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/malowikizifebapupup.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/37659131165.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/61466879933.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/75293001738.pdfIn PDF document text
    • http://ailizia.com/userfiles/63092549470.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/junizidagi.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/dimenogo.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/37040405755.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/n95296mug3lfaaevp0mstmd0m6/20043366654.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/64849089448.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/65554442453.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/wibusovaxojori.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/69649429486.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210903_131720.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f586df15b---vonokebikagorasimasa.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/zolupunodunabuxevogalo.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/060954536590.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/zirisikoxabevifemesu.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/lalitidadefeside.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/rovuvaxonuwesopes.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB465 16044 bytes
SHA-256: 9f012bc7176050a162af4a987a41d46636838c2ef6fc75d8d3343e90a0d2f800
font_01_sfnt_off0000dd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD65 10752 bytes
SHA-256: d36eb8150446b7d8b8eb5f45d431c7fe8871df1c9bdd9c3b9d9e5f69ccd8219f
font_02_sfnt_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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