Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f287ebcd7e6d51…

MALICIOUS

PDF

81.5 KB Created: 2021-02-28 14:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 23e8ac16b328ac938cc577484c995523 SHA-1: f0b4dc563880f3f6fee868bfb1aeb0764dadda4b SHA-256: 66f287ebcd7e6d51965d5b03c1167021c14aee2047c9e39b0b8e61f417b58e48
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are to benign-looking PDF files, suggesting a link farm or SEO poisoning attempt. One of the primary URLs, 'https://dugedepap.ru/wb?keyword=how%20to%20use%20a%20coffee%20grinder%20for%20french%20press', is likely a lure to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://dugedepap.ru/wb?keyword=how%20to%20use%20a%20coffee%20grinder%20for%20french%20press PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4458137/normal_5fc8795542b05.pdfIn PDF document text
    • https://mebedepubini.weebly.com/uploads/1/3/0/8/130813558/wowefegar_gakuruf_rifewimiwezafaw_xepisowum.pdfIn PDF document text
    • http://sodowetan.mywebcommunity.org/25170772122.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/woxorojero/pedulobodatulobumuginera.pdfIn PDF document text
    • http://zorijefugixor.atwebpages.com/would_you_capitalize_presidential.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/kixupi.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/18656645489.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/flywheels_transformers_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/warfarin_overdose_guideline_aha.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/free_venn_diagram_template_illustrator.pdfIn PDF document text
    • http://diwifesatikebak.epizy.com/pioneer_elite_vsx-43_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/laptop_battery_charging_circuit_diagram.pdfIn PDF document text
    • http://bezakimodetores.rf.gd/28500157907.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/8363208815.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/marathi_baby_boy_names_meanings.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_off000102dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DC 5440 bytes
SHA-256: f04d306dcdbd1dd0cdbd2abab69ede93bb5a5b1f10a62cf70fb048c044f05f1e
font_01_sfnt_off00011568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11568 10448 bytes
SHA-256: ef52905a0c7be913a4008a7c22cb6bf95b80183cb7df3b2dde5366619ad26208

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