Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4248c5b20f09ec…

MALICIOUS

PDF

87.4 KB Created: 2021-03-31 11:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8a79fead8b102acb73f388b4d8aa3245 SHA-1: 562e1f9e0f51be03d40e168d31ddba99731a55ce SHA-256: bf4248c5b20f09ecb85ec4cd3da6a7db76b82254248211e04be2d7fcff6eb882
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://gimoguvi.ru/award?keyword=center+of+excellence+pdf PDF link annotation
    • http://jedomagisuw.getenjoyment.net/nozixagifoxivowakamovoku.pdfIn PDF document text
    • http://tigukifi.getenjoyment.net/2962201626.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/how_to_interpret_arterial_blood_gas_results.pdfIn PDF document text
    • https://sobidoduwipiver.weebly.com/uploads/1/3/1/4/131406433/xinodajijebiwitosifa.pdfIn PDF document text
    • https://wevofuru.weebly.com/uploads/1/3/4/6/134670173/3529100.pdfIn PDF document text
    • https://nogetutiru.weebly.com/uploads/1/3/4/7/134711470/5699617.pdfIn PDF document text
    • http://wavoximebipota.iblogger.org/banking_companies_act_1991.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/nextbook_ares_8a_stuck_on_loading_screen.pdfIn PDF document text
    • http://wugupomovupa.sportsontheweb.net/13282747927.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nosepevozux/toxicwap._com_movies_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/much_ado_about_nothing_watch_online_free.pdfIn PDF document text
    • http://dizogusuvi.rf.gd/free_hr_incident_report_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/981b9811-dfa7-4e4b-b973-bcd84baebd5e/kafaxoxibonivep.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/76177501799.pdfIn PDF document text
    • http://koraxirimaxodet.epizy.com/juruloxutifoluburasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be71befd-6c04-48ea-a1a1-a270271f0373/71059152773.pdfIn PDF document text
    • http://josegofubusem.epizy.com/cisco_earnings_report_2019.pdfIn PDF document text
    • http://luvibiw.epizy.com/mahakosh_beams_report.pdfIn PDF document text
    • http://mifotabelimudon.myartsonline.com/23224537647.pdfIn PDF document text
    • http://wozitoso.atwebpages.com/age_related_diseases.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 4592 bytes
SHA-256: 15883557f0b630c36a222343215c5d0924d7b80a95aa410cc61eb523bef0a204
font_01_sfnt_off00011b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5F 11424 bytes
SHA-256: 0b721d3e8199729d5ef05704c2838b22c3ca02dce142f84dc0286c2991366e44
font_02_sfnt_off0001421f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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