Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b639d41eb602be…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 00:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88c6a77abf6c4cc37eabbb28509a25b7 SHA-1: 5171763f784baa3ac40d600974efab450adba01a SHA-256: f3b639d41eb602be7c18ed250cf070c8b21fedd1cef6ddc356fed2de1caaf989
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external URIs and is identified as a link farm, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious intent to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://gres-k.cat/userfiles/file/nakebuvurenigumaxoze.pdf
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/foboxejozigipiwi.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210911080817.pdf
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/taferenuxaxes.pdf
    • http://skkl.cn/filespath/files/20210918002252.pdf
    • https://pharma-tools.pl/galeria/file/vefuzur.pdf
    • https://thietkewebseo.com/webroot/img/files/11635154388.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613d440b1d87f---84655566602.pdf
    • http://sysquare.com/UserFiles/files/wotam.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8303332d7b63f6c805000cc2fea162e6/dakarinamubabumajudasus.pdf
    • http://polletnv.be/uploads/files/lobomopore.pdf
    • http://women-for-marriage.com/ckfinder/userfiles/files/mopivavegaxovokavegagosim.pdf
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77056787809.pdf
    • http://webinaris.biz/ckfinder/userfiles/publics/files/39878095218.pdf
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/79925196097.pdf
    • https://vieclamlaocai.vn/webroot/img/files/70335963750.pdf
    • http://519pf.com/userfiles/files/23802119621.pdf
    • https://www.esfa.bg/root/ckfinder/userfiles/files/sezef.pdf
    • http://mobiliteit.nu/files/livazodawuwefoxexegonefir.pdf
    • https://marwaservicecenter.com/nbloom/fckuploads/file/8651657512.pdf
    • http://sicompk.com/survey/userfiles/files/wurosafadiza.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/vawewefipinuzasiziriref.pdf
    • http://drapa-technika.cz/UserFiles/File/buvopunepitadugizixenufam.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=fallout+shelter+modded+apk
    • 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_off0000d931.bin
4d8f5032fa90c74a9f4fae7d69b823896d00b515250d55719ec4d37489310b46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD931 16716 bytes
font_01_sfnt_off000104a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 16792 bytes
font_02_sfnt_off00011cbb.bin
f8c750ba7f81c66a6fdaf82b568c88e735c194bc1b93c5ce973ebd3437dc4d78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBB 10632 bytes

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