Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c05c1c005b968e…

MALICIOUS

PDF

94.3 KB Created: 2021-02-19 10:18:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1002f47c3d05ba395cbf5ec6b0fe2425 SHA-1: 0a1e719d93cad23029f8b442cf8817e07cc5849d SHA-256: 09c05c1c005b968e1268f2d5a7e43bdebe4229590814907b8ca3ede7611d1953
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the presence of a mass external PDF link farm, with numerous URLs pointing to PDF files. The embedded URL and the document body, though heavily obfuscated, suggest a lure to external content.

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://jacksth.ru/wb?keyword=what%20precedent%20was%20established%20following%20the%20marbury%20decision PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367940/normal_602ce588cd8c7.pdfIn PDF document text
    • https://vefapabawi.weebly.com/uploads/1/3/0/7/130740427/2193958.pdfIn PDF document text
    • http://adanakebap.org/50863085681r8rw2.pdfIn PDF document text
    • https://tamexixufose.weebly.com/uploads/1/3/0/7/130739892/40a9c1c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368485/normal_5fef0bda2bfea.pdfIn PDF document text
    • http://shoop-ff.ru/bofokusiignxl.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/sazimoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_601c88d79ed17.pdfIn PDF document text
    • http://hempmap.ru/xarowis9oq1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490953/normal_5fe0e6a942810.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/wifiduxezo/formic_acid_bee_sting.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/briefing_template_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/16527826110.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/arabic_fonts_for_autocad_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/travel_gift_voucher_design_template.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_off00012ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF1 5916 bytes
SHA-256: 7fb2844fd1a807b4b1f410bf17e83e91ea455062e80f6750586532210c296b83
font_01_sfnt_off00014404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14404 11892 bytes
SHA-256: 0aeecfee1a144f82df4206946c7b223b2b7690d6f370efed311d055cf3edf625

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