Malicious PDF — malware analysis report

Static analysis result for SHA-256 e229dcf0e7f8bcac…

MALICIOUS

PDF

77.6 KB Created: 2021-02-27 22:24:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7fd05ebc378194641dfe2b2fc95394fe SHA-1: eedf35c6f2d34f4dbd9ac5e2a16a6a34e31acad8 SHA-256: e229dcf0e7f8bcac32e5b981188ab600848aefd4792cc2cb7207fa1765829b32
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or redirection scheme designed to obscure the ultimate destination. The primary URL, https://golowaki.ru/strik, appears to be part of this scheme. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly suggest it's designed to redirect users to potentially harmful sites.

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 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.
  • 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://golowaki.ru/strik?utm_term=captain+underpants+book+11+full+color PDF link annotation
    • https://cdn.sqhk.co/muwanije/jhbsUic/57280217035.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/sgiihhg/67596581918.pdfIn PDF document text
    • http://copyrightshelpscenters.com/clasificacion_de_grannumymxcf.pdfIn PDF document text
    • https://nufawufaza.weebly.com/uploads/1/3/0/7/130740177/noniridudip.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/hjghbif/bingo_party_2020_free_tickets.pdfIn PDF document text
    • https://xagofutaruv.weebly.com/uploads/1/3/4/3/134344009/dijoxetuj-lufiwemof.pdfIn PDF document text
    • https://futokodoneru.weebly.com/uploads/1/3/0/8/130814407/1100270.pdfIn PDF document text
    • http://peuly.xyz/mafazuninaxakazv7nbj.pdfIn PDF document text
    • http://reduslim-italy.site/68968709036i8vmr.pdfIn PDF document text
    • http://fredo.run/degrees_of_lewdity_blogojt2d.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/nLidhhK/16376191777.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zitulogakapede.myartsonline.com/95764345178.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/asfixia_perinatal_gpc.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/bagrus_bayad.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/93796108364.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/fopivujefibinulipoluvara.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 5312 bytes
SHA-256: 197f08404205f1bf483913701fbf263edbb4da4e4e941a017109f819616a43ae
font_01_sfnt_off0000f664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 10560 bytes
SHA-256: 82f41f662cdada12836e28844f6f4ac6a938e9b282b7880c906e7c1d9235141b
font_02_sfnt_off00011aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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