Malicious PDF — malware analysis report

Static analysis result for SHA-256 623810ebcd750e29…

MALICIOUS

PDF

74.9 KB Created: 2021-01-08 05:55:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4fd47491ae9d5519e13f92f358c5f234 SHA-1: c835783cb58b5f7422625b532b0f19f112988f91 SHA-256: 623810ebcd750e29b7e3d40379351a9d61850221c666261e5fb56e3e479a3299
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'traffmen.ru'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, suggesting a link farm designed 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 distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=bonnie+the+bunny In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416935/normal_5fb988f28710c.pdfIn PDF document text
    • https://worubagazew.weebly.com/uploads/1/3/4/6/134639575/mazipurutepi_vijito.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374847/normal_5fcc1b6dd079a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5f967427a562e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503309/normal_5feff41c7505a.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/vabemavuputenif/zupotuxorixizelor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5d067f3-2a95-4039-8626-f14b8479297d/doterra_ddr_prime_softgels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b00dfbd-0d5a-43c5-b686-6ed1aeb91199/4909156868.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/igneous_sedimentary_metamorphic_rocks_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/android_phone_mockup_free_psd.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/41340087466.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/sinus_rhythm_ecg_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/lizoloso.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_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 4548 bytes
SHA-256: 49bc18b6fff8c71b5e8754d27db57df1ef80518c7fc989b865be60ebbf85466f
font_01_sfnt_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 11484 bytes
SHA-256: e9a6eaa7d387ed34d9a339d615e52c4f6cf5bd48f2c8d421af478cbd792f82c3

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