Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f093cefb7e6dd2…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 12:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5938ab458e08afd55ecbe75825d31f23 SHA-1: d97372213a42a27cc295780eb6606183f428ea80 SHA-256: 08f093cefb7e6dd2c1d3e50fb7fd1a8efa2c30f5a7d54d6c48c6136ad39b85c6
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of URLs, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to obfuscate the malicious links or to perform further actions upon user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://softwaretesting.kr/club/data/userfiles/file/20210911233010.pdf
    • https://lecachet.fr/docs/files/13344222518.pdf
    • http://flynewsletter.com/uploads/file/xuzuxonutanojizek.pdf
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/wazujunafawuwujizezazu.pdf
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/ferezukubemematelimowaza.pdf
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22417689762.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/45638527237.pdf
    • http://arredamentoambienti.it/img/file/tokijejofitenawofi.pdf
    • http://toanthinh.vn/webroot/img/files/wipadevulanu.pdf
    • http://emeraldcovepartners.com/_data/images/file/64582453655.pdf
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/43905606753.pdf
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/gufenoworug.pdf
    • https://pmcp-avac.com/files/upload-ckfinder/files/xiloromuxifotaf.pdf
    • http://oilspecchem.com/files/pufezebikofopu.pdf
    • http://www.lbtfilm.com/uploads/files/gavuj.pdf
    • https://southafricapools.com/contents/files/ruviwudewijumuso.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134af0f29be3---91719028554.pdf
    • https://lifo-sea.com/ckfinder/userfiles/files/lofuxuvi.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/wijuvugiwedex.pdf
    • http://prime42.ru/userfiles/files/83062204659.pdf
    • http://p-energo.ru/content/file/96972666262.pdf
    • http://cana.vn/uploads/userfiles/file/757883793.pdf
    • http://4998horo.gmmwireless.com/contents/files/moxuz.pdf
    • https://hoongnau.com/upload/files/dufagodule.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mirror+cast+apk+for+android+tv
    • 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_off0000e16b.bin
118832004e566141bc318ec42bad62c34ea6080755323cf76ec4c34989df0831		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 18584 bytes
font_01_sfnt_off00011169.bin
babf4515ee4dcb0f19d0f0901aaeffd2789aa0f56bc3d0d124b3bd2e30e5303a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11169 10588 bytes
font_02_sfnt_off000129cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129CC 16792 bytes

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