Malicious PDF — malware analysis report

Static analysis result for SHA-256 783583bb2807cbc3…

MALICIOUS

PDF

77.4 KB Created: 2021-03-23 04:07:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1435f7ed9b4c2b714b0f5ccdf514c415 SHA-1: d3c7f74d0046c3b27b22c573c723e654a205a1ae SHA-256: 783583bb2807cbc35363e29c3b9e8352aa9a163acca3dfcf00e795ac8e98cba3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/award?keyword=advanced+renewable+energy+sources+pdf
    • https://tebifenan.weebly.com/uploads/1/3/4/6/134675993/0ddb61ffbcbaf3d.pdf
    • https://rorobobadewa.weebly.com/uploads/1/3/1/1/131164171/7b4f0cb438ade22.pdf
    • https://bodokevusigow.weebly.com/uploads/1/3/2/7/132740435/3220284.pdf
    • https://cdn.sqhk.co/fakobijo/WzhiQjg/space_wolf_tactics.pdf
    • https://cdn.sqhk.co/zedugixaka/BsYmngg/21625033152.pdf
    • https://cdn.sqhk.co/kuretunaba/hqibjaZ/gafavetifetixasil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2d118382-c45d-47b0-9225-4ac575c183a9/lisulaxosowasiw.pdf
    • https://uploads.strikinglycdn.com/files/213bc2fc-f6cd-465b-844f-f61ad72f4629/does_thrawn_die_in_rebels.pdf
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_49059e0f9a2f48ca8777e5b66927e592.pdf?index=true
    • https://4ab51db4-2ab9-4ce7-8cf9-a7235cd4f8a6.filesusr.com/ugd/c6359c_bd026c586d654a81a5741d47da0fd8f8.pdf?index=true
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_36c3c3a543664ddab2afdc0b96bd0549.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3103c547-8413-4358-a0fa-768efc8b9ac4/bipepusonalujakirakuki.pdf
    • https://d798de41-6847-46d1-b877-4f1b84f556ee.filesusr.com/ugd/3e315c_75f27f80605b4997b31fe2a503c0fa32.pdf?index=true
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_b6bcfe7f5445428781b72a1d24d91236.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f6d82093-3db3-4e72-a6a3-4af5bab59a1e/asus_x205t_battery_price.pdf
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_18ce5f03987f4288a3501c0083aa816d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/94fee063-3f90-484c-9ac6-60f93fe9cbdc/how_to_create_a_mind_map_for_studying.pdf
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_786648066800405283e8fd320f5e51ca.pdf?index=true
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_8f2bd92c139242faa5c482424b411991.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_off0000eedb.bin
1e7bea16ed1624242a3b926192d3d5df0fbfdbc9629b575dba767f4c7fc66e9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDB 5704 bytes
font_01_sfnt_off00010274.bin
defd500b9ffa6918bed1ef57b4aa99c201610003cdb84d738c5783511da7f07b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 11136 bytes

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