Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4f628cd0c916b7…

MALICIOUS

PDF

67.8 KB Created: 2020-11-18 04:29:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 976d924cb8ce18312cf4913337718312 SHA-1: 17d13214e4e5e5ed79190415cfae47dae4208c81 SHA-256: 2d4f628cd0c916b7b60d2c0a4d80034a68456d8bbe71ae9a6c1b536af58db7ad
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to benign-looking documents but one suspicious URL, 'https://trafffe.ru/123?utm_term=slug+it+out+2+hack+2020', is embedded. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or scamming by directing users to malicious sites.

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://trafffe.ru/123?utm_term=slug+it+out+2+hack+2020 PDF link annotation
    • https://vujedivu.weebly.com/uploads/1/3/4/7/134768767/pofuxamatalasizogal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449788/normal_5fa714a7b0b98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f887301e5c98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459780/normal_5fa7e4705c95c.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/7e0ee588c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387412/normal_5f9887a747474.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/henghuili-files2/sophocles_antigone_in_the_oedipus_cycle.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/beach_hacks_bed_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/reporter_young_wrocaw.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/nujumemezipogi.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/personification_worksheet_7th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/fegasogibitadewoxuvuse.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/jensen_radio_jwm70a_manual.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_off0000cf66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF66 5228 bytes
SHA-256: f2f29e25af5fba819c16becfe748ac4fa25eafdb44d055af3c371ffaaf96b4ed
font_01_sfnt_off0000e130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE130 9592 bytes
SHA-256: ad8eea46e72502be0bcaefe1920248fc008516e2ca3738aaba8adbcc4004776f

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