Malicious PDF — malware analysis report

Static analysis result for SHA-256 a624868a38af6c6a…

MALICIOUS

PDF

84.0 KB Created: 2021-03-16 04:49:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1c71e3c423bf51ea93fac0bb28fd1a4b SHA-1: c9b3ff3b243c25629cf6b6788ce207c5885ff87c SHA-256: a624868a38af6c6a00af24fbf51425f716d35322d9f32707124d25bb4828142f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to external resources, likely for malicious purposes such as malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://pelibifir.ru/strik?utm_term=communication+style+inventory+pdf PDF link annotation
    • https://cdn.sqhk.co/fugutexifi/oOhbhfd/jen_ceballos_age.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/12108912898.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/e7ggjd1/vr_escape_game_2_level_19.pdfIn PDF document text
    • https://cdn.sqhk.co/gukitane/paB8Sif/39880882348.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/iasumjc/township_of_union_public_schools_salary_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/ies4gjx/metal_slug_2_apk_mod_unlimited_lives.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452161/normal_5fcd807931529.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421764/normal_5fef343ea4cfa.pdfIn PDF document text
    • https://cdn.sqhk.co/munoforifuso/Nibhgyp/pazixodo.pdfIn PDF document text
    • http://lowabunuzoxa.getenjoyment.net/que_es_un_patogeno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_20630071efae4b3a9b783d22fe6fd34a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/instagram_followers_apk_modded.pdfIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_e944632088c542deb92cddaff30a9552.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/julaxel/trivia_game_template_ppt.pdfIn PDF document text
    • http://xafibejijopo.atwebpages.com/building_cost_estimation_book.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/how_to_use_a_sewing_machine_step_by_step.pdfIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_9dd970404eef4514b4d0777ebed340a1.pdf?index=trueIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_f87cb86b60e6439c8e7f1e43e928ba66.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_off000108c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 5368 bytes
SHA-256: d6ce8afd688731b0a1f9c2bd3e5f05fbe22e30159b7b1c3af0238209290057ab
font_01_sfnt_off00011af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF7 11968 bytes
SHA-256: 76aae3c781fb3ae8c936a710a5f4ebce7849334385177d09cec404a2095ddb30

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