Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf93cdb3045e589…

MALICIOUS

PDF

72.9 KB Created: 2021-02-26 14:15:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 952b2d5485a5c5643cd1b9c8ecf7979a SHA-1: c2219f3d4753c1f48393a62d195ae8e9bcc99c1d SHA-256: fdf93cdb3045e5899861eee91441c3d01dad46bf6f8dd96cdfcc24c7b8b7234a
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm points towards a spearphishing attachment attack pattern.

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://bologen.ru/123?utm_term=ge+spacemaker+laundry+repair+manual PDF link annotation
    • http://toppiksnack.xyz/betisawozovutuginanimewjv2l.pdfIn PDF document text
    • http://sberpodarok2020.online/argos_white_fitted_sheet_doublex4q2j.pdfIn PDF document text
    • https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/700b7bd75.pdfIn PDF document text
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/1079878.pdfIn PDF document text
    • http://goodik.fun/736337525872o7ob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gulesovel.epizy.com/43738664253.pdfIn PDF document text
    • http://tagugatukosag.epizy.com/clair_de_lune_piano_sheet_music_original.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/sale_and_leaseback_agreement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/83649302427.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/43860221402.pdfIn PDF document text
    • http://sajulugebimisu.myartsonline.com/panasonic_phone_clear_blocked_numbers.pdfIn PDF document text
    • http://voxosejak.rf.gd/free_powerpoint_cycle_diagram_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/fuzoruvuwafe.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_off0000de7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7C 5416 bytes
SHA-256: d805ee9f727c96ca19b32c15e0243254144bfc2438aad8ccb1e224a51ccb7cf6
font_01_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 10716 bytes
SHA-256: 91315318632182f3ae140406a118c9e940624c75a53ccc450b959e8292e36706

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