Malicious PDF — malware analysis report

Static analysis result for SHA-256 7286fb7b7b41bf13…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 04:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40fac878425bbc7486abe12b5f6cfdfe SHA-1: b19103f00a2f39e02aec0d156e0fd566d47e6883 SHA-256: 7286fb7b7b41bf1315450bcacf5ac5e830f5c00009339840f85da0d4cfd7614d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external URLs, many of which are part of a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=amino+community+manager+apk
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/68ed2306b7bb776abc4fb92e1353e7e0/98883614652.pdf
    • https://daquin-ferriere.fr/userfiles/file/75789155243.pdf
    • https://monyetjoget.com/contents/files/92828502665.pdf
    • http://rebornfair.com/FileData/ckfinder/files/20210905_314EBAA90E9C4761.pdf
    • https://bandotrading.it/uploads/file/tubapose.pdf
    • http://simpelms.nl/userfiles/files/74764623946.pdf
    • http://billedbutikken.dk/articlefiles/file/gulilav.pdf
    • http://www.nachtruhe.info/up/files/nemiw.pdf
    • https://profix.fr/ckfinder/userfiles/files/68724994554.pdf
    • http://beta-rc.com/upload/files/mofonazogerekokeduvivim.pdf
    • http://www.lnk-creation.fr/upload/file/potadotukinabozenufitose.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f9793535198f92c5cc7d95b63ed03bc7/5829795022.pdf
    • https://astdubai.co/userfiles/files/62772935143.pdf
    • http://luligang.com/ckfinder/userfiles/files/31689022020.pdf
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/34046233015.pdf
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/77240489135.pdf
    • http://toyteepee.com/uploadfiles/file/210925035448700032bafmlx.pdf
    • http://travelshops.pl/userfiles/file/50329045747.pdf
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/89145466940.pdf
    • http://le383.com/uploads/files/90518121240.pdf
    • http://aihyang.com/userfiles/file/2452698149.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_off0000aeb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB7 16792 bytes
font_01_sfnt_off0000c6c9.bin
85ed9476b4de56b54862cba58ddeabe4535dbff4e544652dae099f087c5a0a52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C9 15580 bytes
font_02_sfnt_off0000ee56.bin
041bd66c25e9437e41c864d251945e27da8bffd5d303a9f5a740741049e642e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 10788 bytes

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