Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6fbca6fdcf9f4d…

MALICIOUS

PDF

85.4 KB Created: 2021-02-22 12:58:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5a19b647dca6450db08b07334dd2f8d3 SHA-1: a318851c5087f230b60b981bbb67ddbfc03d4f1f SHA-256: ef6fbca6fdcf9f4d984cf0220b0b1cb557415de929c2b58ad482e820c4252884
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=where+are+karst+landscapes+located+in+australia PDF link annotation
    • https://cdn.sqhk.co/tazuxalana/nPhc1UD/gopro_max_360_video_settings.pdfIn PDF document text
    • https://solejibanumiro.weebly.com/uploads/1/3/4/4/134489880/gerizogibodivijem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463298/normal_600aa2e1acb34.pdfIn PDF document text
    • https://sevafigetof.weebly.com/uploads/1/3/4/9/134902911/fofepabufevaz-lonagigin-tatutobuzin.pdfIn PDF document text
    • http://vekeludin.iblogger.org/15771512184.pdfIn PDF document text
    • https://dewokipapofoz.weebly.com/uploads/1/3/2/7/132741709/xumaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368227/normal_601b6efdc11ab.pdfIn PDF document text
    • http://prequester.online/sp_racing_f3_flight_controller_deluxepq69u.pdfIn PDF document text
    • http://lestyprin.online/literatura_de_cordel_infantil_para_imprimirsdshl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378619/normal_5fe188de03273.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/Rijhhjz/liverpool_echo_lfc_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500887/normal_5ff97c289cc8c.pdfIn PDF document text
    • https://degufulu.weebly.com/uploads/1/3/1/3/131379990/nexubes_besotolajus_vuvonuxubi.pdfIn PDF document text
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/140fe342ea38d1.pdfIn PDF document text
    • https://cdn.sqhk.co/surixirulol/NTHgf8C/guide_for_lifeafter_survivors.pdfIn PDF document text
    • http://velesvoyage.ru/kodorigimivopy4jzi.pdfIn PDF document text
    • https://tatonipek.weebly.com/uploads/1/3/4/8/134874136/b455b73ca70.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/DJmhe2o/favo_de_mel_goiania_valor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5F 5236 bytes
SHA-256: 33e76b8607baf490864bf13e98fbcf6d2c2230f4bf98bdb4c76dcfa523f95b2a
font_01_sfnt_off00011f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F33 13404 bytes
SHA-256: 31bbd632793551a161bdb2a3ebdd13dcff265189a684fb05715372d4345ad1e3

Open this report in the interactive analyzer, or submit your own file for analysis.