Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ab5537c93ce59f…

MALICIOUS

PDF

77.6 KB Created: 2021-03-16 17:31:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4e696fb355d36095c5cf402b638f8b9 SHA-1: 8e0c50a2f72b16f09c7791de5de400e0efc4c5c0 SHA-256: c2ab5537c93ce59f127a9a457c9990033f5f55c206eccd10ad222c59da631c60
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous embedded URLs, with a notable heuristic flagging it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/wix?keyword=mass+stoichiometry+worksheet+answers
    • http://nububezobuto.22web.org/chennai_express_movie_free_720p.pdf
    • https://static.s123-cdn-static.com/uploads/4426421/normal_5fee541adcf37.pdf
    • http://remudotufed.22web.org/xigolaga.pdf
    • https://cdn-cms.f-static.net/uploads/4488349/normal_6040f654432af.pdf
    • https://cdn.sqhk.co/kewudomavave/0gcwjbS/vizemilupuzaxuwomimoz.pdf
    • http://levupag.22web.org/fuvuvigobogokul.pdf
    • https://cdn.sqhk.co/tejikeluz/gjaHgjy/gukowutotadumageratamel.pdf
    • https://cdn.sqhk.co/kufusivekogo/hjBgeht/free_templates_for_google_slides.pdf
    • https://static.s123-cdn-static.com/uploads/4373520/normal_5febc3047b91e.pdf
    • https://cdn.sqhk.co/wemavutulow/hc1giVI/47961926114.pdf
    • https://cdn-cms.f-static.net/uploads/4467975/normal_6041db331939d.pdf
    • http://nakomajuvedina.iblogger.org/why_wont_my_hamilton_beach_flexbrew_work.pdf
    • https://cdn-cms.f-static.net/uploads/4368244/normal_603c6a7c79215.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://togubetaxiki.epizy.com/anlage_vorsorgeaufwand_2020_formular.pdf
    • https://s3.amazonaws.com/jedadokuti/nugasogifogogemigasaz.pdf
    • https://s3.amazonaws.com/kudufigunabi/38725473220.pdf
    • http://fanevisexika.epizy.com/14247648003.pdf
    • http://potubavaziripek.epizy.com/river_durance_kayaking_guide.pdf
    • https://s3.amazonaws.com/gozifep/38459346153.pdf
    • https://uploads.strikinglycdn.com/files/c0ddd650-e8b0-45e1-a69c-f3e949600f95/free_willy_cast_and_crew.pdf
    • http://wumumusonozukak.epizy.com/android_build_version_21.pdf
    • https://s3.amazonaws.com/mefadedosuw/64164759847.pdf
    • https://uploads.strikinglycdn.com/files/15fcb2c6-a3db-4386-bad4-c19190594cd8/phrasal_verbs_list_advanced.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f2.bin
b41613e8cffaacd052c47283ecff869c04364e785d5d72725640460aeba074dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 5268 bytes
font_01_sfnt_off000102d2.bin
ed65e1ef876330033609112e7f323ee7d64e356d21fd9d8ece29da5220312753		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 10988 bytes

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