Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8585027fb4d356…

MALICIOUS

PDF

78.7 KB Created: 2021-09-19 08:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 68260c9b31004b539ba55dc0d661e264 SHA-1: 4826383bed2a5f5f145716e67e148506970ce6c0 SHA-256: 2e8585027fb4d3568ad0eee285b87796313b5b78de0f90687df715333980fd28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many unknown-reputation URLs strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://queure.ru/uplcv?utm_term=alagappan+medicine+7th+edition+pdf PDF link annotation
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/juwefuvipifififofinop.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/nigamusivenusowal.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/87946021181.pdfIn PDF document text
    • http://amkchem.com/upload/files/13152873305.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/befelefupuvivivo.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161469ded65c8e---jotatigufadezusi.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/4544043644.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/zominemuzugamupisi.pdfIn PDF document text
    • https://oferta.lt/i/File/4317165488.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/gerolitivuzaromuve.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/nridbutkarjrdvi4hh50e6dm64/71119317883.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210911175726.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/44475889067.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/kudigikunigiwubonizomemuz.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/sufigubibolujenemi.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/bapowugege.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/43104799075.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61386650346.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/rasizalen.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/gexidufosedu.pdfIn PDF document text
    • http://4darchitecture.org/img/all/nalijase.pdfIn PDF document text
    • https://noventa.cz/media/files/file/47454392122.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/bebutewerib.pdfIn PDF document text
    • 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_off0000cec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 17628 bytes
SHA-256: 30d05eee78f6ab5afc76aa466e30161f8c37d81b818db556b77abcda99d75503
font_02_sfnt_off000114d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D2 10832 bytes
SHA-256: f81661799d00bdff92a306b57b1a7858108d823762f3ac4f89e4ce449428715d

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