Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed94b9f2495b5257…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 09:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce79dcf6f756676eff239f8898d3470c SHA-1: 84194ec7913cea13c6b2557ee27dc650adb6e914 SHA-256: ed94b9f2495b52575ebf56f2fd6f9d90806e050b7d3ed1a5093a8fc3863e74a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://oniceh.ru/uplcv?utm_term=zombie+highway+2+game PDF link annotation
    • http://lnianemarzenie.pl/userfiles/file/75527764350.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/rowegimosekewob.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/rijagimopobuzar.pdfIn PDF document text
    • https://gulamanis.com/contents/files/36623555966.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/56070148767.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/4734324402.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210904_F179188EED408A38.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/24852204311.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/63618053518.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/4823808699.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/94557599845.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/wixurukajawezapik.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/99286144053.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/53021823316.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/gobugajuzivapomuvegiz.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/58606641480.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2b918bc8---fifodiremuvoviwafu.pdfIn PDF document text
    • http://elsped.hu/files/file/95988458786.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/83634384282.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_off0000e66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 17652 bytes
SHA-256: 2ee8594639e8b7ba3de72d2ea0914f14526afcc38f2792e0d0ecea9c100d606e
font_02_sfnt_off00012c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C68 10464 bytes
SHA-256: 788df761efab5580349bf80db944ef6db443d5b9ac83bae6aaff34a51efda58f

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