Malicious PDF — malware analysis report

Static analysis result for SHA-256 05565e0fbb5dab38…

MALICIOUS

PDF

74.1 KB Created: 2021-06-01 15:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 36e3be421198bcd36489d2467e1bb62b SHA-1: 581dec8c3627f820e10b010ef08f743bbc77e2d7 SHA-256: 05565e0fbb5dab38e46ec3f5692d8abcc597b6090896e3a947069c91eb807d0a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://huntic.ru/pbw?utm_term=adobe+reader+10+offline+installer PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457838/normal_5fce69b70946a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490974/normal_602b73e439952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415546/normal_6019c42abd220.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386837/normal_5ff98a0bd6a34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386849/normal_60059ec0bc4bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424672/normal_6067a0657b8e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446643/normal_60430d0bdd7fc.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4373243/normal_60b0199681754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424010/normal_6018f80a6da8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_600aedf9ee85f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450047/normal_5fe0e3da1ab2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424007/normal_6051b674651ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422390/normal_5ff2039801fc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391317/normal_5ffa9c39bd25b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489599/normal_60671ba0bf7e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415531/normal_605a589d82533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_5fd8309b8fdb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452845/normal_606e5382974b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuvevetub.pbworks.com/w/file/fetch/144421527/calibri_bold_font_free_download_mac_os_x.pdfIn PDF document text
    • http://togusan.pbworks.com/w/file/fetch/144427842/zilofel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5e09b04-7c34-4508-8c7c-4af7ee699758/is_data_science_degree_worth_it_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c821b1cd-4442-492d-865a-3fc5a4077f5a/niwodomisugawiliwig.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/f/body_reset_diet_snack_ideas.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/gamasapilawarobopuzuzeva.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_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 5224 bytes
SHA-256: 7d361aa4701880ee224f45a6be0f2becc42c7aa8c575e93dd281b80dd110100b
font_01_sfnt_off0000f6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 10696 bytes
SHA-256: 640d035e74ac5749bfd88e49220d9d4c962503c5c606e3cd7d4dc383a70906db

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