Malicious PDF — malware analysis report

Static analysis result for SHA-256 461c989e4e29d3d4…

MALICIOUS

PDF

70.6 KB Created: 2021-06-12 08:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: dd8e6fe1d17b39fbe7ca1e3c0dded993 SHA-1: 1cc72dd28a5a8b4af8a8b0d7453c7fd5cb9d4cbd SHA-256: 461c989e4e29d3d4d5162f6e4e096e5abf03d05341b992f13790b8a34b5efaa2
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 0.9997

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 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://allytemp.ru/pbw?utm_term=calligraphy+arabic+font+download PDF link annotation
    • https://butebonej.weebly.com/uploads/1/3/4/6/134640772/6992939.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_600704065e000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494417/normal_60c338d8ca043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487631/normal_5fe02a85aaf64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_6014ff8b9cdd1.pdfIn PDF document text
    • https://jokilexagazoxo.weebly.com/uploads/1/3/4/6/134602179/mojufobefekas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470832/normal_5ff3ca247a68b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404122/normal_5fe8a72ece18b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xedidovetaw.pbworks.com/w/file/fetch/144414642/nikebidigajodunemojune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/470168cb-c2c8-4ce6-a2d0-d45084477de7/nukovotiderunejobidusozek.pdfIn PDF document text
    • http://zajozote.pbworks.com/w/file/fetch/144477414/milady_chapter_17_practical_workbook_answers.pdfIn PDF document text
    • http://zuvuwiro.pbworks.com/w/file/fetch/144725058/roxexetemo.pdfIn PDF document text
    • http://sagabum.pbworks.com/f/gexadozoxugefogi.pdfIn PDF document text
    • http://vikowezanipe.pbworks.com/f/food_chain_and_food_web_worksheets_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afe37ad4-6dc0-4a0d-8b93-33b33d4d484e/how_to_recover_from_ac_joint_injury.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_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 5476 bytes
SHA-256: 63be7cc3372b124c868df7ff8764db53b065322d378ecf2a711bc614d835b1a6
font_01_sfnt_off0000eaf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 10212 bytes
SHA-256: 48ffebd1ef0dc3a61e7d10c70089dcad1ee9845625983894e51ecc77c8cf8075

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