Malicious PDF — malware analysis report

Static analysis result for SHA-256 475a923880c93da1…

MALICIOUS

PDF

79.4 KB Created: 2021-03-17 09:24:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 28eee9501d7c43763886d4a814f35916 SHA-1: 9eabefdf87fce5e5449f193468d26633ab5ab15a SHA-256: 475a923880c93da1cea3c19cfad878c50b99fec999ad1ede2b95e9e94ca5d2ca
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://ponafet.ru/wix?keyword=fireworks+worksheet+pdf PDF link annotation
    • http://ceiling48.ru/93786080788yslyf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498330/normal_601cbab45d9c1.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/jgUGicz/5479866153.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/gVibja0/97844991531.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/iehglqs/disneyland_paris_deals_christmas_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/gipekoma/V3TzjcJ/vuzavirisekirojumukerowup.pdfIn PDF document text
    • http://itdiscount.info/pes_2020_pro_evolution_soccer_apk_obb2zwk8.pdfIn PDF document text
    • https://cdn.sqhk.co/lojumisebu/1GbhiK0/recorder_notes_for_beginners_hot_cross_buns.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_603fbf8f810dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_d0fc5167dae7455398c968d029712242.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/41290660576.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/2407135419.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/arcsoft_media_converter.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/65415003804.pdfIn PDF document text
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_d2533e62958b48fbaa5bbe8b87b6db40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/manual_chevrolet_prisma_2015.pdfIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_a73652b554f34f55a1d02c313c158be8.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 5000 bytes
SHA-256: fa70fd5b7e17e02a8284938af43d4ca7626e11b9a68f55f6f5258825744f3f41
font_01_sfnt_off00010b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B37 10908 bytes
SHA-256: a09224b8a9471f803ebfc2532386aba8e7749bcf00c12923e65a233880bf3032

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