Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef37a0494854985…

MALICIOUS

PDF

108.9 KB Created: 2021-03-22 00:07:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5ad507688a4bccf1073ad0822158eaac SHA-1: 8eb5b5931cbb029f30374a99d02c59c7731d261f SHA-256: 2ef37a04948549850fa9ae87a16600a7f9d8fc6ff92526b79cc56e092c2ea267
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URLs. One prominent URL, 'https://xajibur.ru/wix?keyword=economics+chapter+3+study+guide+answer+key', is embedded within the document's structure and appears to be the primary lure. The PDF's structure and embedded links suggest it's part of a link farm designed to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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=economics+chapter+3+study+guide+answer+key PDF link annotation
    • http://wefinexof.iblogger.org/xonenurojotowinatu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443372/normal_6053b0c30225d.pdfIn PDF document text
    • https://cdn.sqhk.co/jasorevujoxu/cCehfhe/civil_design_excel_sheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_602fbfca919cf.pdfIn PDF document text
    • http://razidazimako.iblogger.org/37440826802.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/cidBiei/fapoxifejov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482872/normal_5fcc8292a88fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446496/normal_5ffe2a16dfae6.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/gdwjfOD/53408456860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489976/normal_60329f9838e8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402711/normal_5fc8eb689b468.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/jeQ0hcn/47210186367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476434/normal_601bcb3b9802e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_8fdbb1dc821043bf993cf094c9d54757.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd6220b-bbea-43b9-a87b-d30cdc8b4a62/big_faceless_java_library.pdfIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_1fe28d3cb6294f708aeb04326a241555.pdf?index=trueIn PDF document text
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_c0ff718caa894565a230e8b9a3f3f6af.pdf?index=trueIn PDF document text
    • https://50c84cdf-c8d4-407e-a307-361b94491100.filesusr.com/ugd/f2656e_461bf5ffb2c84cb08f9dc073b2f94485.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/99726d60-47e2-4f53-af19-d12c838f6d22/what_to_put_in_a_hurricane_survival_kit.pdfIn PDF document text
    • http://kofodubelo.rf.gd/schlage_connect_deadbolt_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6ef3001-887e-41c2-b1de-bcd7c51e271e/where_is_the_fuse_on_a_husqvarna_riding_mower.pdfIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_67099c9297ad4dec9ba9ac86e7e3cc0e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3441e81-f596-4a03-9cb8-a910f1318ea0/kizifun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecef5060-e7a3-4dda-a7ce-8c7232e32cc9/51589493056.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
    • 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_off00015451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15451 5832 bytes
SHA-256: 32ec703a6cf57cf0f9321e1c66fe0ff0111c5e768abaeb1e8cc4eb675ed25387
font_01_sfnt_off00016820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16820 11692 bytes
SHA-256: 8dc2d60eae311824c6505f5d6493449d25c97098cbb694072c7efc9a3ff44325
font_02_sfnt_off00018fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FD4 16320 bytes
SHA-256: 4aa67ef7990f9f722a461ceecbd9944631fde5a7423c5b0b0849fe532563edfa

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