Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6bbd65ef100548…

MALICIOUS

PDF

87.2 KB Created: 2021-03-22 09:57:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eefcea8a5d7082c1060b3b0e1c8680a3 SHA-1: 71c496aeb3f8d6efb47fe5244790a8252eee7b8c SHA-256: 4e6bbd65ef1005483a91a51871a8a28377eae96a6a0856f8d0f49160215f1fb8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://botokaw.ru/123?utm_term=androidx+lifecycle+scope
    • https://static.s123-cdn-static.com/uploads/4385648/normal_5fedfbd663128.pdf
    • http://piguredadesab.iblogger.org/reflection_over_x_and_y_axis_worksheet.pdf
    • http://probkin34.xyz/2021_learn_calligraphy_big_horizontal_happy_plannerrh789.pdf
    • https://cdn-cms.f-static.net/uploads/4416923/normal_6021605d579ae.pdf
    • https://cdn-cms.f-static.net/uploads/4447084/normal_604ade7a6de5e.pdf
    • https://static.s123-cdn-static.com/uploads/4372101/normal_5ff65dade4d73.pdf
    • http://mazikopipovix.mywebcommunity.org/66546506230.pdf
    • https://cdn-cms.f-static.net/uploads/4375206/normal_600d5109663ee.pdf
    • https://cdn-cms.f-static.net/uploads/4417037/normal_6055f35b4ea4c.pdf
    • https://cdn-cms.f-static.net/uploads/4407303/normal_60550c42963bf.pdf
    • https://static.s123-cdn-static.com/uploads/4459463/normal_5fca06c7473b1.pdf
    • http://copyright-infringement.business/lubulaclj72.pdf
    • https://cdn-cms.f-static.net/uploads/4470960/normal_602985fccf122.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_698f86a0bb904a3ab57cadcd3942e8fa.pdf?index=true
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_5897cd16df9f41978dc4755c1c72aa34.pdf?index=true
    • http://ginowane.onlinewebshop.net/gijabasaxit.pdf
    • http://segimoto.myartsonline.com/ruwumelijidirixiberekux.pdf
    • http://jibimom.myartsonline.com/loponera.pdf
    • http://piwiweranewu.rf.gd/gamesir_controller_pairing.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_off000118f4.bin
b21fdd2b760805ad4a26d24204eaae535242607ed31603dec9f6e160a4185eb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118F4 5096 bytes
font_01_sfnt_off00012a6f.bin
3982844d3b218901ae2a7cf7b23644cde8035d07419d6cf7591e0d4a4f346d61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6F 11312 bytes

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