Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa145b28f19bcaf…

MALICIOUS

PDF

66.3 KB Created: 2020-11-17 01:32:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6205c530a0bc9501bd152141b8c0bbaf SHA-1: a1ebe7733766925cd2f43b2d034b3ce2537ed931 SHA-256: 7fa145b28f19bcafe6398d68f1079ff3498eba907d169d7eacb13d545739d770
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including a link farm heuristic firing, suggesting a phishing or SEO poisoning attempt. The primary external URL points to a site that appears to be a lure for downloading a PDF, potentially containing malicious content or redirecting to further malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=macbeth+act+1+questions+pdf PDF link annotation
    • https://kiteginizi.weebly.com/uploads/1/3/1/8/131871518/3654fd138aa4b92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485572/normal_5fb2767487017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385436/normal_5fadb9930882f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389106/normal_5faf50be178e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447434/normal_5fa4eec29976c.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/dovulavavo/75373555233.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/wikexokilad.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/lorogol.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/spatial_analysis_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/berlingske_serif_stencil_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/julius_caesar_act_4_scene_3_sparknotes.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/38968475034.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_off0000c874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC874 5440 bytes
SHA-256: 4eee8700fd25358be01462798e5bd044b6b72b2a044682d0012ac0619ae15b5e
font_01_sfnt_off0000dafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFA 9920 bytes
SHA-256: fe5b001162576be250ef0d74f484987ef31c95abc15437e02eb562f7fa8de2db

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