Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac80a94bf341b04…

MALICIOUS

PDF

72.2 KB Created: 2021-02-18 19:24:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0d3e657ecc07636b1f40cd1e60d67349 SHA-1: 8b66d456556647e41d00bd79af0507d0b83ab3ff SHA-256: 2ac80a94bf341b0422aca94b63392d14e192efe82a3c57e1fbf172471da7360a
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 malicious intent to direct users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or link-farming attack vector.

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://leonvi.ru/wix?keyword=square+knot+bracelet+closure PDF link annotation
    • http://vosusapar.22web.org/lugamesawemi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417139/normal_600bcb3c23605.pdfIn PDF document text
    • https://gevamimukeruku.weebly.com/uploads/1/3/4/6/134656740/fimiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478968/normal_602e38634f2db.pdfIn PDF document text
    • http://lamorebeduzakoj.22web.org/rowebejafot.pdfIn PDF document text
    • http://barivelovone.22web.org/babitefu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446773/normal_6008a70deb638.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bagofawinigadeg.epizy.com/11050327986.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/huron_ohio_glyph_reports.pdfIn PDF document text
    • http://dasetalolup.epizy.com/request_letter_format_for_school_admission.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/jowesenokemefejemoxizizo.pdfIn PDF document text
    • http://kodekexonalana.epizy.com/wurapiletoniwepe.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/31439944357.pdfIn PDF document text
    • http://susodiwur.epizy.com/xepazowekulalimigexiv.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/parazapumofazonow.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_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 5228 bytes
SHA-256: 23af2f3617ea344951ac316e7dd15a6e25e5f5d3c1e1d96b6cb48625117c2f9a
font_01_sfnt_off0000f172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 9976 bytes
SHA-256: 50e3b710c57560e9db5ccd4c148469fbf2446d31673189221eeb788f4b42633d

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