Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6cd51031e868c3…

MALICIOUS

PDF

71.3 KB Created: 2021-09-12 00:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 461c68119d21fffc5460383b083e8c3e SHA-1: 5546fc5ad44dd1d56d2c58d1e3a5d5d0bdbc1668 SHA-256: 4a6cd51031e868c36035c0df44d8150bbe98a0e4510c71220bc0a3dfa40f57ec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The PDF also functions as a link farm, directing users to numerous unknown URLs, likely for phishing or malware distribution. ClamAV and ML classifiers confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/760806f52426f37d27285b674593add4/dinijupamatoxalesidafez.pdf
    • https://deepex.hu/hirek/files/bugiwazokofebevex.pdf
    • http://bibliotekaludwin.pl/img/upload/files/11273003489.pdf
    • https://oreopay57.com/ckfinder/userfiles/files/19081117094.pdf
    • http://www.cottagegrad.ru/files/file/jajemabojalisipojejomugox.pdf
    • https://jerseyshorepirates.com/userfiles/files/40405293078.pdf
    • http://wisdomtours.net/upload/file/sogojujirekimito.pdf
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/62782719172.pdf
    • http://stimatacasa.eu/userfiles/files/rumezexafufi.pdf
    • https://hotelangela.hu/userfiles/file/97267033821.pdf
    • http://mindentudor.hu/userfiles/file/75790640254.pdf
    • http://prinsart.ro/uploads/files/82886957786.pdf
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/fesawemi.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labegubeguzezedujupiv.pdf
    • http://maivietnamesecotati.com/uploads/files/8112374065.pdf
    • http://metzlerranch.com/userimages/81464829731.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/413990021cdb1fc6134e46f3fbcb81f0/14501940691.pdf
    • https://bonvoyageindia.in/ckfinder/userfiles/files/97284536865.pdf
    • http://patroha.hu/file/53903156589.pdf
    • http://sport-zavora.cz/data/file/rirelasewuvonuzesu.pdf
    • http://sushibelovo.ru/files/juzevoxidanupenut.pdf
    • https://serviceservice.eu/userfiles/file/52054613544.pdf
    • http://carnow.jp/js/upload/files/ludomebipun.pdf
    • http://satthachkhe.vn/image/file/31782942552.pdf
    • https://ip-pharma.net/data/files/42721549886.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+update+android+on+samsung+galaxy+s3
    • 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_off0000b47c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB47C 16792 bytes
font_01_sfnt_off0000cc93.bin
e552e7686eeac25db9e0b71fc3a9bdabb9cd135c48db0be0fcd41785a5edf07e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC93 11300 bytes
font_02_sfnt_off0000e6f2.bin
2f4dcf8595d5af41fa112c003b828bc2815fcb095e38162b6479c28fcc0d744c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 15716 bytes

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