Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f597d191044e784…

MALICIOUS

PDF

79.4 KB Created: 2021-09-11 09:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3936d20699f7eef53f7719a5d18cdb0d SHA-1: 9144ffb94fdc404366c9da6ba4e05ea6589de3aa SHA-256: 8f597d191044e784077444a0c83cc5af678753c314c9f2a92fd3d1ec6da7e897
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to distribute links across various low-reputation hosts. The embedded JavaScript is likely used to facilitate redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://clinicaveterinariabilancino.it/userfiles/files/67286055814.pdf
    • https://yifff.se/userfiles/file/70041908070.pdf
    • http://clinton.abwingsmd.com/uploads/files/vepoxelafuxi.pdf
    • http://hasdeu.md/data/userfiles/files/nibovig.pdf
    • http://gospelpour100voix.com/fichiers/newsletter/file/zekiti.pdf
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/nitimejovesisobi.pdf
    • http://www.uc-kushiro.net/images/library/File/nexugixupibovinofesi.pdf
    • http://aygroupmuh.com/image/files/gexadedonetawezife.pdf
    • http://maihome.hu/admin1/file/38896847382.pdf
    • https://firsatpin.com/calisma2/files/uploads/89866431226.pdf
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210902_224852.pdf
    • http://feach.ie/images/uploads/file/74860564561.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/muligimosemu.pdf
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/61811719346.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/sarogilukizezofeja.pdf
    • http://euromarkcreations.com/new/fck_img/file/38883449888.pdf
    • https://tidaksusah.com/contents/files/80724965869.pdf
    • http://factory-01.com/js/upload/files/xepetaniwarevibekikipuluk.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16130c50f2f61c---logedi.pdf
    • http://nriloan.jctoursandtravels.in/files/xubokabelafebaz.pdf
    • https://grafconsulting.pl/Upload/file/30822029920.pdf
    • http://dh-cell.com/ckfinder/userfiles/files/didubutakijifefope.pdf
    • http://mega-stainlesssteel.com/uploads/image/files/dokolesotuwojar.pdf
    • http://coomargroup.com/ckfinder/userfiles/files/7437175986.pdf
    • https://yoimart.com/upload/file/20210911140310.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ppsspp+games+naruto
    • 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_off0000d260.bin
90e151f4d51a5ecd54d56026e446a9c6710cc984a42e971acc56b9d0ca1be476		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD260 10560 bytes
font_01_sfnt_off0000ea7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 16792 bytes
font_02_sfnt_off00010290.bin
b687fd057d4dc25db049631747bb3df65c8f07addd15d48580520279a076e125		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 17404 bytes

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