Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e97d935e0b97335…

MALICIOUS

PDF

66.6 KB Created: 2020-11-18 01:49:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 21ec38ee4a47a04a71767bc140f1e189 SHA-1: d1f472a11419528611ecb5bcf3b6ad1d45e0c91d SHA-256: 8e97d935e0b9733512148cf943b645fdd020eb69e8e772dc3f2aed0995806b60
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, but one prominent URL is associated with a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is part of a link farm designed to distribute malicious content or phish users.

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 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://trafffe.ru/strik?utm_term=vampire+diaries+season+3+episode+10+online+free PDF link annotation
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/1cf22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5fa469c247863.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/zewimu/collections_book_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/m_p_manual_safety_lever.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/27507945008.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiwovowus/eicr_form.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/fofaviwudademenupuwiva.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/overuse_of_water_corrective_fluid_may_cause.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/prorated_rent_calculator_move_out_date.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/plant_responses_worksheet.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_off0000c6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D4 5508 bytes
SHA-256: 8c8a7157665a11ed655910042d2507231a9f82cce6966750e8d9ac15b4886772
font_01_sfnt_off0000d97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97E 10344 bytes
SHA-256: 8ad92f7110db3cf5c688c800fcd87f75cb8a8832bdeb0ff971d39ae12c8c4b2c

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