Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ef35a8de39d40b…

MALICIOUS

PDF

77.0 KB Created: 2021-03-02 23:16:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: afc52ea8387485c964b6024f7630a545 SHA-1: 5443c509ac6d71702b22c412b6c1ffb59fa96bff SHA-256: c3ef35a8de39d40b0ca5c1432d84a63a2e0f0a58ef6297e05a5cde3a6259ac45
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 0.9996

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://ponafet.ru/strik?utm_term=how+to+pair+bluetooth+remote PDF link annotation
    • http://malanefire.sportsontheweb.net/xomepekatakajotefo.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/how_to_replace_batteries_in_first_alert_carbon_monoxide_detector.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/IihaFtZ/dabuxed.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/58420451972.pdfIn PDF document text
    • https://cdn.sqhk.co/xivijela/pPugfji/15864380770.pdfIn PDF document text
    • http://fituxem.sportsontheweb.net/gemupozivukuxo.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/why_is_psychoanalytic_theory_important.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/sKhiBhd/74224250145.pdfIn PDF document text
    • http://rajenajodaf.iblogger.org/pawerarapaximadipatex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5fd12b2a92686.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/2468519928.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/fjhRCji/nursery_rhymes_for_babies_video_download.pdfIn PDF document text
    • http://tirudibemaj.22web.org/kualitas_sumber_daya_manusia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_6032986ccdbd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469103/normal_5fdf0eb55b0a1.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/ijeieja/sudadiliwuzefobelurebemo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419822/normal_5fe8b89894c7e.pdfIn PDF document text
    • https://cdn.sqhk.co/nepofigiper/iuAihl1/espn_97._5_twitter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xopidevuk.rf.gd/68857639350.pdfIn PDF document text
    • http://ziwawadu.rf.gd/comets_asteroids_and_meteoroids.pdfIn PDF document text
    • http://vilumepidiwego.myartsonline.com/72646572384.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_off0000f16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16F 5076 bytes
SHA-256: 3ba40bb3d93c2c2d7f985a0e9e3d3d5cf13648ce22ce2a967c55756bfdcbf169
font_01_sfnt_off0001028d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028D 10496 bytes
SHA-256: 79840ee81144737e1268fd558593f339d695a43f0532fed24d6e8572d57a191c

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