Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa7e553fa419289…

MALICIOUS

PDF

69.2 KB Created: 2021-09-24 16:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ae77ac6b29cf4ee2d1e726e9830c77a SHA-1: b1f5175d311b35bff29cc2192ed623d8cddd971b SHA-256: caa7e553fa419289633a23fbbb2ea63484c87585dd65974104c2ba4ab35d4207
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO purposes, likely to distribute unwanted software or lead to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=instapro+2+apk+download+2020
    • http://vino-charlie.cz/userfiles/file/zojarabinifiguforizomeb.pdf
    • https://alternatifhirdavat.com/upload/ckfinder/files/vozobewanegovuzetar.pdf
    • http://smelawservice.com/file_media/file_image/file/pikigufunuros.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/232f4e0ce74ddcb985836208fd6366dc/zajisipebuzodego.pdf
    • http://metabolit.ru/files/file/10491792886.pdf
    • https://dagvandearchitectuur.be/_files/file/miderijugijuzutibibonul.pdf
    • https://crownprolaw.cn/userfiles/Proj_Name/files/18887957839.pdf
    • http://2m-m.eu/userfiles/files/pelofovizefe.pdf
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/lofefiwe.pdf
    • http://balalajka.nu/media/63645115505.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/45627802250.pdf
    • http://abwcolley.com/uploads/files/51599913584.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6b6ba626bc95ef62a0890ba941e303b9/95028038647.pdf
    • http://www.kowel.com/ckfinder/userfiles/files/1630940965.pdf
    • https://briljant-maleri.se/UserFiles/files/vupanubisuzo.pdf
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/33467891150.pdf
    • https://www.aukuras.org/ckfinder/userfiles/files/tusisemuwopoxodiramati.pdf
    • http://kotrackusa.com/fckedit_file/file///20210916_17_41_46.pdf
    • http://lnimeina.it/userfiles/files/11080961715.pdf
    • https://weborder.cloud/userfiles/file///62480554429.pdf
    • https://babetravelling.com/ckfinder/userfiles2/files/34217564825.pdf
    • http://brkvinc.com/userfiles/file/ziberarisuluxife.pdf
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35034861158.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_off0000ae55.bin
5bda98e09641204fe723df893fea750aa1a74c5bf8898f42d0edb8a87d89f86d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE55 15868 bytes
font_01_sfnt_off0000d6cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CD 16792 bytes
font_02_sfnt_off0000eee4.bin
2013f3e70ca253b137c1ed3449da4f9e432bde27b3526d8f1b85da22e2bb7d08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 10532 bytes

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