Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45399713e9a0217…

MALICIOUS

PDF

76.8 KB Created: 2021-01-06 18:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8eac3c2967eca120afd5b9dc977f7009 SHA-1: 7c084352370220cba2f4373e8eb65f2ac7a394d9 SHA-256: c45399713e9a021762a3cdd3ae92db9998b34777dbc06b4ffc061ff8b2dadb9f
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document functions as a link farm, directing users to multiple external websites, one of which is a known malicious redirector. The document's content, though obfuscated, appears to be a lure related to "unblocked dirt bike games at school". The presence of numerous PDF links and the use of disposable hosting services indicate a phishing or scam attempt. No scripts were extracted, but the heuristic firings strongly suggest malicious intent via redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/123?utm_term=unblocked+dirt+bike+games+at+school In PDF document text
    • https://topodomero.weebly.com/uploads/1/3/2/6/132696018/vupineso_kadawebapibi_sodovejukol_dafiriru.pdfIn PDF document text
    • https://gejeximiba.weebly.com/uploads/1/3/4/8/134897602/566ce1.pdfIn PDF document text
    • https://faxojoduso.weebly.com/uploads/1/3/5/3/135351685/xozukopix-pabifuz-tepilasunumiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403819/normal_5faf4da35de84.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/81378.pdfIn PDF document text
    • https://pakilimog.weebly.com/uploads/1/3/4/3/134363837/migezadegugil.pdfIn PDF document text
    • https://pojixaguwor.weebly.com/uploads/1/3/1/4/131453565/2c8fd99430.pdfIn PDF document text
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/7203059.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/tabobujimo/sequin_formal_long_dresses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba4982c-c232-40a2-9b27-020ee2e0ea8e/thermaltake_xaser_iii_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1905503-fd9c-484d-8c4e-7257ae3d5e65/regexilorezem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00c7b2e2-29ac-4fc0-9add-f1cc53bf2674/55860438251.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/semitupuxavotok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12f0f3b5-6347-4a57-8c11-979a85535bfa/directv_sunday_ticket_free_email.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_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 5548 bytes
SHA-256: 13c859bd7f0e08f9f35a448578f4de2ac42258c76fe3d851f32f79d135baa2d4
font_01_sfnt_off0000ff4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4F 11436 bytes
SHA-256: c2bfa56ca909bd49055d94940c6bf4a652be1a2342f5d594cae8ab790ba1047c

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