Malicious PDF — malware analysis report

Static analysis result for SHA-256 e721863ddf564fea…

MALICIOUS

PDF

89.7 KB Created: 2021-05-15 17:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccbc8a0e4ac2473dafbbf2106dffbf64 SHA-1: 9200daa0a1e5a61fe13360d1ac2c2c55cc043594 SHA-256: e721863ddf564fea0d0fcbafc69e260df7e8103bf726b96ec49a6d6411491036
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one identified as a malicious URI. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The embedded content, though heavily obfuscated, likely serves to obscure the malicious links and potentially execute further actions upon user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/strik?utm_term=is+there+another+series+after+the+heroes+of+olympus
    • http://luchdobro.site/68494485330ks96o.pdf
    • http://euroshopmn.space/fulltone_ocd_version_1.4_reviewsnfnvo.pdf
    • https://ragivigelogupow.weebly.com/uploads/1/3/4/5/134525503/1061189.pdf
    • http://pixunune.sportsontheweb.net/wudasaw.pdf
    • http://ninuxalezopo.getenjoyment.net/tupotabofofefesif.pdf
    • https://dajukufatob.weebly.com/uploads/1/3/4/3/134345308/3465475.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://313cea95-bd78-4864-9d9d-3b26c3bbe0bd.filesusr.com/ugd/2142af_8a8a6f46ad264decb8aec198799488be.pdf?index=true
    • http://tanonarimunal.myartsonline.com/russian_fairy_tales.pdf
    • http://ziwivazud.onlinewebshop.net/valivikezebufixazuga.pdf
    • https://uploads.strikinglycdn.com/files/e6793a26-03f2-4b1a-9e4e-65e98446abdf/tc_electronic_flashback_delay_vs_flashback_2.pdf
    • https://uploads.strikinglycdn.com/files/dbe089b1-6447-4225-b3cb-073d42e1fb29/wegadop.pdf
    • https://uploads.strikinglycdn.com/files/d221bd24-92dc-4cf2-9285-dd2d0cf22be9/jibipedonufuberamifibepo.pdf
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_13bcf5ed30f24b31a2b616349f1e8946.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5b2e52f8-de28-40f7-999e-ee44e07e8aae/integral_of_1_sin2x_cos_x.pdf
    • https://uploads.strikinglycdn.com/files/c2777e99-3f94-44e4-94cb-d9ed22242a0e/pojazagemapodusu.pdf
    • https://uploads.strikinglycdn.com/files/8e1190bb-c1cf-45b2-b096-194a1f9fd935/71205470012.pdf
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_892eaca068104568b7a627c37a576daf.pdf?index=true
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_bfe8696108244d67a656c6f75d7c0154.pdf?index=true
    • https://uploads.strikinglycdn.com/files/070fa1cf-1bf5-495e-a899-3ed608a0828f/davis_drug_guide_for_nurses_app.pdf
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_3c2abd504e474d6aba07d75942c8c20d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1283443b-4436-4c03-b9a7-807992058ae2/86530982424.pdf
    • https://uploads.strikinglycdn.com/files/c99028e0-0ef6-455e-a697-3ecdf25f44ce/mopaposebakuvij.pdf
    • https://uploads.strikinglycdn.com/files/cca544fc-ef3d-4c26-a0f9-0e867d3a7a5d/macroeconomics_for_dummies_download.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_off00010bce.bin
b988b11a68c3b089f5b0c3c5901503992a8a87caf8483d8d59f0f3d1285f53e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCE 5180 bytes
font_01_sfnt_off00011d4a.bin
c961d0224c856f107b903134ad3d3c7e576f129c69f6d195525289a50a821d10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4A 11144 bytes
font_02_sfnt_off0001437a.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1437A 16164 bytes

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