Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b7f706ec658d57…

MALICIOUS

PDF

74.8 KB Created: 2021-03-06 04:47:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5161f69facad8c2e0a6f55877ace621 SHA-1: 74def5f93b6ef4fbe14057784468bfd2652f78d7 SHA-256: 31b7f706ec658d572ac3e52155503116868b168cb29cab21ab40c7177ef62158
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/aws?utm_term=connect+router+to+motorola+surfboard+sbg6580
    • http://podifodosej.scienceontheweb.net/how_much_does_cdl_school_cost_in_oklahoma.pdf
    • http://mobeditobaxul.scienceontheweb.net/joxukixi.pdf
    • http://fozivot.mypressonline.com/88029404670.pdf
    • https://cdn.sqhk.co/jasurisunav/hhfjfdF/magic_piano_tiles_3_apk.pdf
    • http://melowimaz.getenjoyment.net/what_is_an_isekai_anime.pdf
    • https://cdn.sqhk.co/rulopojuna/khajajb/36895811190.pdf
    • http://wofeboz.66ghz.com/17415256903.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_1d85f1b5599946c88f989ff3144be6b1.pdf?index=true
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_28443279c0054ce8a0349c7400b1c48e.pdf?index=true
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_54f5176ec8274953857cfdd1e7ffde66.pdf?index=true
    • http://palelezugob.onlinewebshop.net/91677711522.pdf
    • http://kubudafexajik.rf.gd/feralodi.pdf
    • http://keporeninudo.rf.gd/28648449197.pdf
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_d9da17a90353497094689158703c7536.pdf?index=true
    • https://041f977c-1598-48cb-b578-3d63f550c8ab.filesusr.com/ugd/524ae3_36e55ad2c9e747f2892d5a513f3ce96e.pdf?index=true
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_f071396e4ccb4cf6b1d1d51c165d1339.pdf?index=true
    • http://tiluxusimutine.atwebpages.com/xifopuzovolegogekakeniza.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e551.bin
4d10e15c07a130ec89494d5662fcc8e8f2a275934c0283c252615185fae8843b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 6000 bytes
font_01_sfnt_off0000f99b.bin
39fd10de8dbfe850845bcd98f2008f6b6eec323025e8de5d8c9b8ead8e6e3aac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 10632 bytes

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