Malicious PDF — malware analysis report

Static analysis result for SHA-256 8618b323cdf0922f…

MALICIOUS

PDF

65.6 KB Created: 2021-03-20 09:47:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c534d36d44e28f08488ca9e2fd8d0fab SHA-1: 92594a9bb093582b92ad3625639bf3ed34dd8c49 SHA-256: 8618b323cdf0922f414925520d9e76690d191e544576fa9572fbdf4d1e4dce1c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://xajibur.ru/wix?keyword=pure+land+mariko+mori+ap+art+history PDF link annotation
    • http://nikiwibub.22web.org/lowes_duraflame_fireplace_insert.pdfIn PDF document text
    • http://imedo.ru/22787030257rhzrm.pdfIn PDF document text
    • http://keto-menu.online/39134921031t579x.pdfIn PDF document text
    • http://nitalesilafatem.22web.org/roxitixinibapararuwopik.pdfIn PDF document text
    • http://vehicleusains.com/56801758498ukkh1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497687/normal_604e2955a72f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388037/normal_6012e2099601f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/negonanopix/responsive_video_player_html5.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/murdered_soul_suspect_wiki_guide.pdfIn PDF document text
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_afdf65f54f894d888b2826d0655ce060.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/62747638351.pdfIn PDF document text
    • http://tafoboverel.epizy.com/bioenergetica_alexander_lowen_gratis.pdfIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_e1a06698ea9e4550b3713577bc01b30f.pdf?index=trueIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_2bb9bcb39c694f33b2c9273893ac71c4.pdf?index=trueIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_57c393fec6d94ec198de0e1f2b8defad.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_a4c180bbc758433b88aee4e6c1e0f41a.pdf?index=trueIn PDF document text
    • http://mafilijesov.epizy.com/carmine_gallo_ted.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C8 5368 bytes
SHA-256: c6c72ffb49483f705c7776147d45199850ee8c94d55f4eb4a4dbfff4afcc95dd
font_01_sfnt_off0000d3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 10576 bytes
SHA-256: afe101482367e6264b8e1eb16fea082a0d1c3da7c1595811ab4a6a3c2e0af155

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