Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d05884419c0fb5…

MALICIOUS

PDF

86.5 KB Created: 2021-03-22 12:34:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: caa934622260979d70d59f86f1de9e51 SHA-1: 5290f6aa7eb52326d4a52e016a6a822aede04abe SHA-256: 39d05884419c0fb55c7eae1e97bbd3b48943ecfebb849ad5d3be98243bc97fcf
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 0.9998

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://kuzutuzo.ru/aws?utm_term=best+multi+effects+processor PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447885/normal_6006784dd293c.pdfIn PDF document text
    • http://wumokejo.iblogger.org/the_cartoonz_crew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368468/normal_6003017dde9d6.pdfIn PDF document text
    • https://bavibexovapow.weebly.com/uploads/1/3/4/6/134643610/jadijo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425514/normal_601d4df271afa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459057/normal_60393a6ea929e.pdfIn PDF document text
    • https://limakeluror.weebly.com/uploads/1/3/4/6/134657352/karavotuz.pdfIn PDF document text
    • https://cdn.sqhk.co/ritafase/geghggr/18554647371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5fda3b30b2e95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407552/normal_5fc841cb37330.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/mukipinomugofifowazovo.pdfIn PDF document text
    • https://ripukalogud.weebly.com/uploads/1/3/4/3/134391837/38e3237a67bde3.pdfIn PDF document text
    • https://xakelagus.weebly.com/uploads/1/3/3/9/133997825/wadusufepelidamiveli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483331/normal_6053ae9a0f4f7.pdfIn PDF document text
    • http://faxixovojaja.sportsontheweb.net/piwaluzib.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/vgi3xgi/physics_class_9_sound_ncert_solutions.pdfIn PDF document text
    • https://fomukudir.weebly.com/uploads/1/3/4/4/134403856/6455864.pdfIn PDF document text
    • https://cdn.sqhk.co/ledivure/iib4pia/grandpa_munster_costume.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gobonelore.epizy.com/ahmednagar_live_weather_report.pdfIn PDF document text
    • http://vudatuvabejosix.epizy.com/driver_asus_a455l_windows_8.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_off0001136d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136D 5000 bytes
SHA-256: 703f1beae43f8f7d68dc2de048ea64a7558b54f4e237304394f945629bcb769d
font_01_sfnt_off00012463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12463 11468 bytes
SHA-256: 10fa6d53c33756a5062103fd0f41c3427c511bae75e1d354003c44ed5cffe6b3

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