Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f9cb6832781852…

MALICIOUS

PDF

73.0 KB Created: 2021-03-06 05:35:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 04c47063d0f0b8afb58952173c9f2e4d SHA-1: 071dd21a0d46bbb5dd3ba2481e11484217a8c0e4 SHA-256: c4f9cb6832781852f1da94c555b44f720d17f8755bc9474dc665647d0e58611e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

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://lozipotod.ru/123?utm_term=replacement+parts+for+kenmore+elite+stove PDF link annotation
    • http://pogawubujogeje.mypressonline.com/what_does_a_norm_mean_in_english.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/how_much_is_a_2019_peterbilt_389.pdfIn PDF document text
    • https://cdn.sqhk.co/ketalidukepi/kMgfich/99877326357.pdfIn PDF document text
    • https://cdn.sqhk.co/piredonina/dP8Whda/gawivov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490116/normal_6041cc50a3e65.pdfIn PDF document text
    • https://turetufifej.weebly.com/uploads/1/3/4/5/134500159/5276437.pdfIn PDF document text
    • https://mizugoveram.weebly.com/uploads/1/3/3/9/133986338/rufikisefimewupop.pdfIn PDF document text
    • https://cdn.sqhk.co/dilujuzaga/rejjMhe/heart_rate_monitor_usa_website_review.pdfIn PDF document text
    • http://rowomonug.mywebcommunity.org/netogex.pdfIn PDF document text
    • https://sitibopifug.weebly.com/uploads/1/3/0/7/130740553/6416053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481157/normal_5fd7004bafeaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491151/normal_5fc98e1a6fd30.pdfIn PDF document text
    • https://gonedosi.weebly.com/uploads/1/3/4/7/134730609/vusemix.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/takixibumukov.pdfIn PDF document text
    • http://xipodijajul.sportsontheweb.net/zajavuno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/movejugatuwunuworo.pdfIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_6b7e00a2b5a74d398e33dfe7f29cb6d5.pdf?index=trueIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_979020cebf41481485c4be7e3d95d15b.pdf?index=trueIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_d9a13e388df74c40a13e018688737aa6.pdf?index=trueIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_69bb9695a1884ccdbaefdf37c0ce256e.pdf?index=trueIn PDF document text
    • https://6cdd0005-1a36-4349-8ed1-a31ee749247c.filesusr.com/ugd/9e53d4_c99cdb2f47ac424ba8be19240f9283b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/sharp_atomic_weather_station_reset.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_off0000e157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 5292 bytes
SHA-256: 19f6f5f3a33755cee7492a3888e47f43b97a8038692a5f66018a52b41bd2736f
font_01_sfnt_off0000f34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 10696 bytes
SHA-256: 657c33d3ffc1c214dfe46be3669d9ca37a88af85ad2be22b2fd37e32d1770c20

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