Malicious PDF — malware analysis report

Static analysis result for SHA-256 07dc35ecd4e17578…

MALICIOUS

PDF

75.8 KB Created: 2021-09-14 22:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 69531be2c500c325ff6cafed2e556521 SHA-1: 53c0d5a903cdab5e135b3079fe3663fce5a8d0ef SHA-256: 07dc35ecd4e175785f23c638f5ebdc4993896e52e5404aebb82a877e81717c0f
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. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URIs, many hosted on disposable domains, suggest a link farm or phishing infrastructure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/gaxevamixoruwanokisoxete.pdf In PDF document text
    • http://auswallendorf.de/userfiles/file/64051126436.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/29308208416.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/56669458001.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38037025272.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/49057935805.pdfIn PDF document text
    • http://proxima-design.cz/files/file/merefafonebuxes.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/firiludexisebekav.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/46755511193.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/41958471126.pdfIn PDF document text
    • http://mopron.ru/upload/files/vawetekalagegitogurozewi.pdfIn PDF document text
    • https://andrejc.si/files/file/73865852104.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/49783039181.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/31514103635.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/fivapumeku.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/52710658019.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/makugisiz.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/nobatune.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/towake.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371f095e1c6---31548118018.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/kosibapov.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/juwusozufofegaket.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/migodefafi.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/87520026528.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210904_73B235893ADA7223.pdfIn PDF document text
    • http://aweibel.com/Photo/file/zozibubip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=best+cleaner+for+android+tvPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC400 17352 bytes
SHA-256: f673da8148a5a2abbdc24f4603bbde4a39bbd899e36bc5e107932b6ddf826a3f
font_01_sfnt_off0000f0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EE 10588 bytes
SHA-256: c5ae78afc751b289cfd6f0a438d8932b3840ad383188532148963461df6d0d79
font_02_sfnt_off0001094b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1