Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4cb548e9ba6336…

MALICIOUS

PDF

73.9 KB Created: 2021-06-06 04:39:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2bcf04b4e1d150adb3450b4a28f30eab SHA-1: 611ae3872643f66c80ab59a799e9bd5bb11ccd4c SHA-256: 9b4cb548e9ba633692d324f40dda555aee01c1f2975480e3c04071216404f623
126 Risk Score

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 0.9996

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://crysiq.ru/pbw?utm_term=como+montar+um+gr%25C3%25A1fico+da+fun%25C3%25A7%25C3%25A3o+linear PDF link annotation
    • https://vemideluguzuni.weebly.com/uploads/1/3/4/6/134680431/lemijoferu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428083/normal_6043bfd141d8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471958/normal_5ff7d0561bbcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367644/normal_5ff11e1f02df3.pdfIn PDF document text
    • https://jokepalebaja.weebly.com/uploads/1/3/4/3/134360350/sevurudaku.pdfIn PDF document text
    • https://xafosaxit.weebly.com/uploads/1/3/1/8/131859261/motoriboxozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477873/normal_60107a403e93f.pdfIn PDF document text
    • https://nogorixarolixi.weebly.com/uploads/1/3/0/7/130740589/subudotaxen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404740/normal_601b7d08419e0.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4410201/normal_60b5b49c10315.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472763/normal_5fee36224a2b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387428/normal_5ff7a8a829d79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wurutaw.pbworks.com/f/xanathars_guide_to_everything_subclasses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5571749c-f54d-4087-97a0-e7581d36e764/ccna_for_dummies_2019.pdfIn PDF document text
    • http://jedilukiwo.pbworks.com/w/file/fetch/144552978/what_does_interpretive_mean_in_history.pdfIn PDF document text
    • http://lesokulovisu.pbworks.com/f/molecular_geometry_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ecb160b-396c-41db-9c13-fc9f0dc76af9/digital_marketing_executive_jobs_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80a9c876-7cd6-43ff-8b2b-0ba3ab6d81f3/97885836657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9feaf60f-364b-4e19-9fc1-1c7672e5fd6f/wemulobi.pdfIn PDF document text
    • http://davixezudi.pbworks.com/f/82682323876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb534d4e-3856-4a83-9dfc-acb7ca25a096/the_secret_history_of_writing_review.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_off0000de38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE38 5804 bytes
SHA-256: 3452f77e41bc24899b979c2bf0bd5393bb6e4a5e3a5a804ecfc914ddf27aad24
font_01_sfnt_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 12684 bytes
SHA-256: 0b73593633a478a288d2f81b0753d4c7b323e4c89ae6582565f395df150422f7