Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95cea5a9622f1a4…

MALICIOUS

PDF

91.5 KB Created: 2021-06-09 18:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9781dc2a8b6ad2bd4d10b3d79bbb2c1e SHA-1: e88b0e67b0fc88dd499433b9936132592169e84a SHA-256: c95cea5a9622f1a4490a8fbf97d66b63d55c78f2f17c15854d3bac2b3ac739f5
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a large link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the 'Urgency / deadline lure' heuristic suggest a social engineering tactic to prompt user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chcial.ru/pbw?utm_term=smash+bros+official+tier+list
    • https://kiwuvewe.weebly.com/uploads/1/3/7/5/137509443/3426922.pdf
    • https://pipenuxoj.weebly.com/uploads/1/3/1/4/131406698/1915723.pdf
    • https://cdn-cms.f-static.net/uploads/4418188/normal_602149e3ad2e7.pdf
    • https://cdn-cms.f-static.net/uploads/4491175/normal_6037a567bb0e9.pdf
    • https://lufuroxula.weebly.com/uploads/1/3/1/4/131408913/tapofixodavefedefog.pdf
    • https://cdn-cms.f-static.net/uploads/4409411/normal_60488cf588075.pdf
    • https://cdn-cms.f-static.net/uploads/4379612/normal_603b1148b3ce0.pdf
    • https://cdn-cms.f-static.net/uploads/4476757/normal_60274a1a083fe.pdf
    • https://cdn-cms.f-static.net/uploads/4484994/normal_6049c7b3b77fe.pdf
    • https://cdn-cms.f-static.net/uploads/4411937/normal_606d5702b960b.pdf
    • https://cdn-cms.f-static.net/uploads/4460446/normal_603c5cdc6c2d4.pdf
    • https://static.s123-cdn-static.com/uploads/4414486/normal_5ff00f1861276.pdf
    • https://static.s123-cdn-static.com/uploads/4452862/normal_6001a1a7f1cf6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pajinap.pbworks.com/f/when_was_the_first_sears_catalog_published.pdf
    • http://muzurinugaw.pbworks.com/f/ghost_in_the_shell_manga_download.pdf
    • http://zidedabi.pbworks.com/f/7709846446.pdf
    • http://nixefijevumu.pbworks.com/w/file/fetch/144576852/93591585689.pdf
    • http://javefanudosa.pbworks.com/w/file/fetch/144678240/lozejarivifaxewas.pdf
    • http://vowujepojez.pbworks.com/w/file/fetch/144752886/46099354934.pdf
    • http://paderukut.pbworks.com/f/60532247026.pdf
    • http://zepadatoju.pbworks.com/f/62045824816.pdf
    • http://ziludezubeju.pbworks.com/f/36913757762.pdf
    • http://jojekepodef.pbworks.com/w/file/fetch/144917085/lusuruv.pdf
    • http://movapog.pbworks.com/f/bikisijotenixejegure.pdf
    • http://tusoxefum.pbworks.com/w/file/fetch/144767604/pikisiliramatisagun.pdf
    • http://pivumiraw.pbworks.com/w/file/fetch/144837135/gree_error_codes_h3.pdf
    • http://gibuwodebu.pbworks.com/w/file/fetch/144489720/jai_ho_jai_ho_tumhari_bajrangbali_dj_mp3_song_download.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125cf.bin
4f2da1b0928f7e617bff6ea3ab334538ebbd3402465384bf50b0d8e3c6dcf37e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125CF 5364 bytes
font_01_sfnt_off000137df.bin
aff6b41263f3c636adc9bb4549ea70acd9c64fe5f29ac68746ea1ec586cf35ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137DF 12012 bytes

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