Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e000c148e805702…

MALICIOUS

PDF

76.2 KB Created: 2021-09-29 13:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a1a6615e5792c37ebb7e82e0efce5264 SHA-1: 640c85cf1306ae0333adb238447523416c362c7c SHA-256: 5e000c148e805702239e6326dbb5083411caeaca0a7aaeb182a6065d4e9e2f26
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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://csc0851.com/userfiles/file/20210908200526_odpuc4.pdf In PDF document text
    • http://casaperugia.fr/userfiles/file/39576039232.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/mopolowem.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/wipugipiw.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/31060036236.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/ruzona.pdfIn PDF document text
    • http://battle.bpv.su/content/files/files/nisifolebavajepamaxutofek.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/17539946198.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/pojifere.pdfIn PDF document text
    • http://ilkemymm.com/image/files/nomodumonuxebu.pdfIn PDF document text
    • https://anup.bo/images/files/50469597104.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/terojokijitorogulotip.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/13768278008.pdfIn PDF document text
    • https://birotex.rs/images/files/wusedidokoduxa.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/74714944473.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/kudorugu.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/likosifowebojidijotez.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613593997bef3---44353100527.pdfIn PDF document text
    • https://pisausakti.com/contents/files/rejevilapob.pdfIn PDF document text
    • http://kustari.net/userfiles/file/zebuzoberazoneladum.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/rotuv.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/58022979340.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/mumelajuze.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/buzagizusawiwela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=reactivo+de+benedict+pdfPDF 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_off0000be70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE70 10548 bytes
SHA-256: 5b78ba0d733a0dc6eaf44b9b7fe6ef998be2c37dd72cdfc1f29794bb52341697
font_01_sfnt_off0000d667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD667 20316 bytes
SHA-256: 4cafe71c6b0c29f5ae18814f23577df04c6f6afe0890a8760c8dc78ccf617759
font_02_sfnt_off00010b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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