Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd17a090c2c737f…

MALICIOUS

PDF

89.8 KB Created: 2020-11-25 03:12:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8be6447547675fbbc5f1409463bb1ed3 SHA-1: b92e1b8a69c7e8e25af7f2fede2147fb9063ef30 SHA-256: 8bd17a090c2c737f618271d7930af9fdb134c0a3e2f9742a39aca10e027e2227
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, with the primary suspicious URL being 'https://trafffi.ru/aws?utm_term=formazione+catanzaro+calcio+1983-+84'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?utm_term=formazione+catanzaro+calcio+1983-+84 PDF link annotation
    • https://fesitafixob.weebly.com/uploads/1/3/4/6/134653549/2594815.pdfIn PDF document text
    • https://bupefozatige.weebly.com/uploads/1/3/4/3/134384552/4019969.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/f654a7e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422893/normal_5f970b939a76f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a07afb4-b3cb-4d9a-8681-a594fdef18ef/96979199716.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/kannada_movie_comedy_scenes_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3382836-fc8e-4dc9-99b6-f76699687591/79519571482.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/55403445365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6703068-f77d-4c21-902c-61410d63fe23/tisaro.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/manual_aumento_de_obligaciones_sat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddba9fd4-8f7d-433a-9b6e-8ef189f58e18/ellen_white_the_desire_of_ages.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012cbc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12CBC 24768 bytes
SHA-256: 238901a79472628b768ee3cff397f49bd0c3b2d360e9ba29d4bc9e6b0d5d03b1
font_00_sfnt_off0000f0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 5460 bytes
SHA-256: 78c6008ef792e48e9416a0262cfbf8a011e210802cdf5b380fd82b539345d4fb
font_01_sfnt_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 12944 bytes
SHA-256: 88f981508f3d4f3c083099d058cde1b21a5243a1f6ddb22ccfa8db0995911d31

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