Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b1177ab893e45a…

MALICIOUS

PDF

73.6 KB Created: 2021-03-14 23:27:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47eef182ba3c0fa8c49c5f6207765912 SHA-1: d74ccb2fe62aa7761ed6467d6a7ecff3ffbc9b09 SHA-256: 67b1177ab893e45a647232ba15ebdeb4b03ea3e2c0b98acc0d4ba6d1feb50a78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are likely part of a link farm designed to obscure the true malicious destination. The primary malicious URL identified is 'https://seumenha.ru/award?keyword=veterinary+bacteriology+pdf', which is presented as a lure for veterinary bacteriology information. The presence of embedded JavaScript and the nature of the link farm suggest an attempt to exploit vulnerabilities or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/award?keyword=veterinary+bacteriology+pdf
    • https://miruvoxizoxu.weebly.com/uploads/1/3/5/3/135397032/bfc271f96f.pdf
    • https://cdn.sqhk.co/samidabaxik/FiaaRyV/github_react_native_template.pdf
    • https://cdn.sqhk.co/gelowidabik/aoFCNz2/42853603200.pdf
    • https://cdn.sqhk.co/durotula/8UGaUhD/72884001287.pdf
    • https://cdn.sqhk.co/gikokimofegi/QhjidTJ/vunopivatidezop.pdf
    • https://rizogogitire.weebly.com/uploads/1/3/5/3/135323834/c63c28.pdf
    • https://cdn.sqhk.co/xomakonezema/jjbzqZo/elements_financial_credit_union_reviews.pdf
    • https://cdn.sqhk.co/rawerusiwala/nijbEie/tununonugi.pdf
    • https://cdn.sqhk.co/modajili/aichaif/zedinolebavof.pdf
    • https://cdn.sqhk.co/xiroxozalal/gjWggha/55681220105.pdf
    • https://cdn.sqhk.co/jovuvufoxet/UZNWihe/ginisufibofazavefaduname.pdf
    • https://cdn.sqhk.co/tememagitapo/6b2qrje/wodamoz.pdf
    • https://cdn.sqhk.co/bazexolareja/idxSYhh/word_typing_race_game.pdf
    • https://cdn.sqhk.co/mirusopujame/J8hhhs2/citizen_rome_review.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_b6bfb4f3a37c4485a3984ba050df78f0.pdf?index=true
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_279438654744402ab50ec26b277f771a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3b2b1ba7-7cc0-4330-8330-414a8408272b/can_you_cook_hamburgers_on_a_george_foreman_grill.pdf
    • https://uploads.strikinglycdn.com/files/d0c41644-92aa-4cc0-97c4-6ae23207b75b/roald_dahl_the_twits_with_pictures.pdf
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_112c7c6974ad402c82a0f0867c15f89e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c710a526-03d4-4e87-b068-055e06b54db4/bofesevulifenaxot.pdf
    • https://uploads.strikinglycdn.com/files/cf8dab93-a8aa-4f30-94fb-9c17fd398dab/el_aleph_borges_analisis_cuento.pdf
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_4e3cb1792aef4027a2c1a36ba71bd321.pdf?index=true
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_874e359fad4c4845848b6cf5882213d5.pdf?index=true
    • 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_off0000e26d.bin
5e1b666d6ea6d1695ea731c3b0a434f6269ed8d06f671d4e235e4671eca29675		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 5352 bytes
font_01_sfnt_off0000f4b8.bin
a3f24b1c4bb43ee676e3edbdad78849b64a6a0090219d9c6f1c577e1ca439f7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 10748 bytes

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