Malicious PDF — malware analysis report

Static analysis result for SHA-256 e196caa66dc21608…

MALICIOUS

PDF

70.9 KB Created: 2021-09-20 16:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 651c72af52b1f5be3708315afd21805a SHA-1: d8b3717ef756f3caa2f265e1347270fcc8c1a788 SHA-256: e196caa66dc21608ab89b4dfcb0b0b7ae1254a49edc6e117b2362ddc182f86cd
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to disposable domains, suggests a link farm or phishing lure. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cosmopolitanhotel.eu/uploads/wysiwyg/files/50509991358.pdf
    • http://medical-1669.com/userfiles/files/87424328885.pdf
    • https://alakharia.com/public_html/userfiles/file/83661026307.pdf
    • http://centroolosprato.it/userfiles/files/vukibebudiza.pdf
    • https://tranhdaquyhn.com/uploads/news_file/webubomuxuwuw.pdf
    • https://artistprasanna.com/userfiles/file/bekovikipubemebugareju.pdf
    • https://aymexco.eu/ckfinder/userfiles/files/jevexufupibazidegutexolab.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/85363167958.pdf
    • https://clove7.com/userfiles/file/61303219490.pdf
    • https://zzhqhi.com/d/files/pipabelemuziw.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/96679574514.pdf
    • https://underworldgear.com/upload/users/files/pefinodabarawagef.pdf
    • http://taaltoetsvo.nl/userfiles/file/21674791672.pdf
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/xofedomagizomedijoxo.pdf
    • http://dentherapia.hu/files/file/63356736611.pdf
    • https://i-chat.tw/js/ckfinder/userfiles/files/40439714255.pdf
    • http://www.americaninvest.net/upls/files/64822700075.pdf
    • https://hurghadalife.net/userfiles/files/zidefebukopuluf.pdf
    • http://aapltd.net/userfiles/file/84505577609.pdf
    • http://abwlondonblvd.com/uploads/files/91960346577.pdf
    • http://epoxidice.ro/mm/file/493414451.pdf
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/likusisomi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+download+watchtower+library+on+android
    • 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_off0000b192.bin
ced3f7ac9620a50d2981f0985115b60f42d63ecde7518612ce315e9261444386		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB192 10628 bytes
font_01_sfnt_off0000c9ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CE 16792 bytes
font_02_sfnt_off0000e1e0.bin
9548d9819189a26ffb1e846088c7228106802fef6c72badfd6f5e09c1f78ae90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 16456 bytes

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