Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1751b122a4be20…

MALICIOUS

PDF

123.4 KB Created: 2021-04-02 23:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89046e66e0f668974ffb3b98c353b25d SHA-1: 76f8265759b2a43e536e52b2fe1e77ded54ccb8e SHA-256: 5a1751b122a4be20774bc6851eb57d4b0e4f1fc7ee4c8bffabf6a87186cae8b7
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URIs, with at least one pointing to a suspicious domain ('vilenefex.ru') that is likely used for phishing or to host further malicious content. The presence of many external links on disposable hosting also suggests a link farm or redirection mechanism.

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://vilenefex.ru/wix?keyword=chapter+test+a+chemical+quantities+answer+key
    • http://girepodemaz.getenjoyment.net/dokovunotebudarirejikina.pdf
    • http://myyshooop227.site/53097233195l9h4.pdf
    • http://pipavinekiga.mywebcommunity.org/amarakosha_book.pdf
    • http://cosmeteca.com/dogs_of_war_adrian_tchaikovskyj8id9.pdf
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5fd644605718c.pdf
    • http://dadevizevarek.scienceontheweb.net/8535359081.pdf
    • http://zijozarub.mygamesonline.org/wozosinugop.pdf
    • http://vajesafosedepur.mywebcommunity.org/nugesirumajufiputume.pdf
    • https://cdn-cms.f-static.net/uploads/4428033/normal_60203914f3add.pdf
    • https://static.s123-cdn-static.com/uploads/4443824/normal_5fdf0e70debf8.pdf
    • https://cdn-cms.f-static.net/uploads/4375195/normal_602ca3f0f2f50.pdf
    • https://static.s123-cdn-static.com/uploads/4470962/normal_5fcff3dbe1405.pdf
    • http://bometaximom.scienceontheweb.net/close_reading_passages_high_school.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/legobegutulo/6545229182.pdf
    • https://s3.amazonaws.com/telasebisu/neravogekisubagesoloruti.pdf
    • http://weponigonimogo.myartsonline.com/teguxagerini.pdf
    • https://uploads.strikinglycdn.com/files/66dfb94b-c089-4c6d-a1b7-a6b44a30e437/68081091543.pdf
    • http://gumizaxewa.atwebpages.com/jugogujobebufafinuf.pdf
    • https://uploads.strikinglycdn.com/files/632804aa-d7fb-4f28-a572-001d37800fde/32961259645.pdf
    • https://uploads.strikinglycdn.com/files/796b3f57-7c3f-4288-b40c-29e543491728/baldurs_gate_dark_alliance_ps2_cheats.pdf
    • http://wawavaroxu.myartsonline.com/almacenista_funciones.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019086.bin
57ea934322d3349ae7f8ed7b9a510705089964bb9e7671cde00bfaf6a3cb1913		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19086 5460 bytes
font_01_sfnt_off0001a304.bin
2b02e3a5432b0af1ab449fd7b7e6c52bc73cc1d9ad53773a96cde115ad4dcbe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A304 11432 bytes
font_02_sfnt_off0001ca4f.bin
3d50f22d3ae6d9a4461c814f81554cc573a3512c555c2f223aedeeaca19cd658		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA4F 16080 bytes

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