Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfcc55fd26afcac2…

MALICIOUS

PDF

78.0 KB Created: 2021-09-17 22:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 580484e26c64b2529407b209dbdd9f13 SHA-1: 3f5ac017e7b57fde8cb34514959c89ab40470585 SHA-256: cfcc55fd26afcac2aa991d20d97eb41a1402f310b2554532301522feb9771c7b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and exhibits characteristics of a phishing lure, as indicated by the 'SE_CLIPBOARD_COMMAND_LURE' heuristic. The document's content, though heavily obfuscated, suggests an attempt to manipulate the user into executing commands via their clipboard. The presence of numerous external URIs, many pointing to potentially disposable domains, further supports a malicious intent, likely to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/c3fceb268b4a0457dafa058491835a73/bevufifoxomalo.pdf
    • http://phunphu.com/userfiles/file/72137488001.pdf
    • https://es21sys.com/userfiles/file/megajiritedusafo.pdf
    • https://presentkompaniet.com/img/content/file/wugojibabutarobedaba.pdf
    • http://spreewaldatelier.de/img/editor/file/katufeguj.pdf
    • https://zbmbudomont.pl/userfiles/file/12618707962.pdf
    • https://vibangnhadat.com/uploads/files/sajudevorunefegodakadumew.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a9cf26fa4f4b793d7c489ee41b520fcd/kunufot.pdf
    • http://sh-songshi.com/admin/upimg/file///18586264438.pdf
    • http://bobiniauto.com/userfiles/file/88540874891.pdf
    • https://die-elke.de/cms/elke_page_files/file/30368785814.pdf
    • http://goldenstarhotel.vn/images/uploads/files/manuvitarud.pdf
    • https://harmony.im/userfiles/file/50553633396.pdf
    • http://jeansresource.com/js/ckfinder/userfiles/files/mijigapotazimugof.pdf
    • https://exihomes.com/userfiles/files/puvuwewaviludup.pdf
    • https://duel.pl/userfiles/file/kijilajewadanitagaxuz.pdf
    • http://parkingparts.com/Upfiles/file/winajileguwakuj.pdf
    • http://chekeeh.ir/basefile/chekeehir/files/roxarapa.pdf
    • http://i-akparat.kz/ckfinder/userfiles/files/sufesavenulusig.pdf
    • http://vegman-kzn.com/ckfinder/userfiles/files/lirexavezezaxanofexin.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=visual+studio+code+download+for+chromebook
    • http://e1pl2.nazwa.pl/busy/fotki/file/daruduranadesagu.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_off0000cc6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6A 16792 bytes
font_01_sfnt_off0000e47c.bin
71a9e70b45547d9f4dac5a47649b53050025ecf226e2a94ea3105aa6ebc5c05e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 17184 bytes
font_02_sfnt_off000110bd.bin
53522727d12b72e201d5f414c653f67ddaadba60bbc1994cc87129b7b582247e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110BD 11128 bytes

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