Malicious PDF — malware analysis report

Static analysis result for SHA-256 a599b6c558f5e712…

MALICIOUS

PDF

77.4 KB Created: 2021-04-01 12:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab07fd0cbedfc8ac9b8cf118af330807 SHA-1: 7fae87069463f24db3f4711ae3990a772ba16d70 SHA-256: a599b6c558f5e7128ed480e6192ab854d425187c1b0fdbbe3afd44e533f57675
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning or phishing, with one notable link pointing to 'https://jacksth.ru/award?keyword=a100+paint+pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/award?keyword=a100+paint+pdf
    • https://static.s123-cdn-static.com/uploads/4471719/normal_5fefdd520b14d.pdf
    • https://jejaparax.weebly.com/uploads/1/3/5/3/135332208/baxasebode-piwigasavekib-wijovifexegi.pdf
    • https://zurudepovog.weebly.com/uploads/1/3/1/4/131438860/6358a32f74eac4e.pdf
    • https://static.s123-cdn-static.com/uploads/4482854/normal_5ff961236d845.pdf
    • https://wobufijurix.weebly.com/uploads/1/3/1/6/131607063/9cd559e49fd9e1.pdf
    • https://cdn-cms.f-static.net/uploads/4485714/normal_6032b558ec802.pdf
    • https://katesagi.weebly.com/uploads/1/3/4/8/134864962/4644148.pdf
    • https://cdn-cms.f-static.net/uploads/4393759/normal_60375ba950b70.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/446c5632-010e-4737-8345-4b2e1709e0c6/easy_piano_songs_christmas.pdf
    • https://uploads.strikinglycdn.com/files/76a380ba-10ce-4db6-b1b2-b92ef9b0b624/41256040545.pdf
    • https://uploads.strikinglycdn.com/files/d9851379-9c04-44a3-969c-d4b9c4e88713/48922701047.pdf
    • http://sumoxajavagal.rf.gd/24387997110.pdf
    • https://uploads.strikinglycdn.com/files/58c9753b-02ec-4110-b0fd-764876f21e90/45913131014.pdf
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_4b21e7f126d3442986c492c56e5d40ad.pdf?index=true
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_dee27270f4b74859a4420d6e5b3bb1c4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/92ff6a7a-d6fc-4ced-8018-611f520411ce/side_effects_high_blood_pressure_medication.pdf
    • http://xosumuzav.epizy.com/eva_foam_sheets_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/dfc41fc0-d297-48ab-afa4-0d55cb099468/ronco_dehydrator_instructions.pdf
    • https://9c7fa877-6682-4281-967b-1772d9bf2649.filesusr.com/ugd/b1277d_8b6d76c2a3594b1097492be37d44e6e4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f46444ef-de3d-4ecf-a2f4-ced440cda86f/kupotilibiduk.pdf
    • http://zejagipusif.epizy.com/bnficiaire_effectif.pdf
    • https://uploads.strikinglycdn.com/files/ac69d176-b0a5-4f26-a79b-f1f1ecb7fb46/zero_limits_ting_vit.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_off0000f19f.bin
4dc6fd12588bbc82a95b44d9f3c4cb699ba7f084e522723f579efd5948813c67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 4912 bytes
font_01_sfnt_off00010279.bin
b69b3650f9fc00e57df4bd4be66ae76f15d1018fc6d41a462704dd533cbc7364		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 11352 bytes

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