Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50685dbc5b78819…

MALICIOUS

PDF

73.7 KB Created: 2021-05-17 08:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3851dd037c8038d8e38b5bd4bda4434 SHA-1: 553ef7211349dd64a57f03807093fdafcfb1470c SHA-256: c50685dbc5b78819fbe34d7ab267a18c0147cb53cd751b262f3d32564316098a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are SEO-optimized and point to potentially malicious content. The document body is heavily obfuscated, but the presence of external links suggests an attempt to redirect the user to malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=highway+capacity+manual+2018+pdf
    • https://cdn.sqhk.co/fafujedajir/gZFIgdv/epic_games_technical_support_number.pdf
    • https://cdn.sqhk.co/rozesivotix/K1hgieM/13255547037.pdf
    • https://cdn.sqhk.co/guwuweri/Ujh5j44/39591943162.pdf
    • http://5coupons.info/65246829142l0zal.pdf
    • https://cdn.sqhk.co/zadorari/jgZkPjb/78636947866.pdf
    • https://cdn.sqhk.co/pedidagow/ia4vx90/zetipumejabibek.pdf
    • https://cdn.sqhk.co/sanevujaguda/jdibeUx/kosoken.pdf
    • https://cdn.sqhk.co/xusarukave/m9gjhhW/4503184883.pdf
    • http://naturaitalia.space/how_to_take_apart_a_kitchen_faucetm2csb.pdf
    • http://podcard2020.site/bofedosopinej38c1.pdf
    • https://cdn.sqhk.co/kolusugego/g8NLigc/adt_pulse_gateway_offline.pdf
    • https://cdn.sqhk.co/zikonidenijo/glhaThe/magimanofekuxebaxi.pdf
    • https://cdn.sqhk.co/jijasitov/ggIMG2m/ally_mens_mountain_bike_shorts_size_chart.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a7999843-8737-4b99-9456-7c5a8daa0ef6/house_of_spirits_book_online_free.pdf
    • https://uploads.strikinglycdn.com/files/79fcacad-21cf-4b8c-b04b-912c4993f634/33016382428.pdf
    • https://d7d9470a-9784-4c28-ac68-b1ab0f70ddf3.filesusr.com/ugd/148484_39c30e57e6db4c2fbe1040e57c36c631.pdf?index=true
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_16e4be6634b54677bdbcc55582f42dc2.pdf?index=true
    • https://6438efa2-cbc3-4905-bec7-85cdafd94a34.filesusr.com/ugd/d1cf8b_cbbc3ed061de4e5587293b75482dcbdc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/11566271-f86d-40cc-be09-38d171887bd0/36321293803.pdf
    • https://uploads.strikinglycdn.com/files/b243f516-66d1-46ee-837d-b6c6de4b55f6/lean_canvas_model_channels.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_off0000df71.bin
7cc3ae778e6b2153391bffa3f10fb9b1cb76a09a66d0df9e0fa607040c0e68f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF71 5968 bytes
font_01_sfnt_off0000f3c9.bin
a5cfe374d5d758d0ba00b16f91b9e2aefae2282f995f2fc2cee06a3bb5439a0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 11036 bytes

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