Malicious PDF — malware analysis report

Static analysis result for SHA-256 864e05e8c1bbb701…

MALICIOUS

PDF

77.2 KB Created: 2021-03-17 09:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0865248c4a211a6b2140ab7d45f4d160 SHA-1: 938663679b44b123d8f469ad39d3aa0cc92c35f9 SHA-256: 864e05e8c1bbb70153f4298f3f5e169bae36d15e467b8bcee4571163fa3ed5bc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numeric slugs, indicating a link farm designed to manipulate search engine results. The primary URL, 'https://kuzutuzo.ru/strik?utm_term=how+much+is+the+bar+course', suggests a lure related to educational costs. ClamAV detection and ML classification confirm its malicious nature, likely serving as a phishing or malware distribution vector.

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-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://kuzutuzo.ru/strik?utm_term=how+much+is+the+bar+course
    • http://letxxnx.org/luxamabogoronogumc9mj0.pdf
    • https://dizogesutupini.weebly.com/uploads/1/3/4/6/134631076/kobukodazavegivexi.pdf
    • http://islta.fun/rigakejobifidax8hjy.pdf
    • https://wolaserirefuf.weebly.com/uploads/1/3/1/6/131637046/belugavagav.pdf
    • https://mibofadap.weebly.com/uploads/1/3/1/6/131637701/7413682.pdf
    • http://resokipuga.getenjoyment.net/mazaxiworigipujizipolu.pdf
    • https://jitugitux.weebly.com/uploads/1/3/0/7/130740190/5211775.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://valupakukav.myartsonline.com/1056303180.pdf
    • http://wivufaw.epizy.com/aashiqui_full_hd_video_song.pdf
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_c814209c1a6e4f0d868e749ffd7eab96.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1700458e-3991-49ef-bea4-3e85bab1878b/49029992211.pdf
    • https://6ba812fd-7407-468e-a879-d7284e591ed6.filesusr.com/ugd/31a575_0353c69b1dbc4c908a2d162b76a51996.pdf?index=true
    • http://suzebotazolonav.epizy.com/center_radius_form_to_general_form.pdf
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_d840d51d58da4f78baf316faaa5eb832.pdf?index=true
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_5756eb5396364d148616d0a4ae830e69.pdf?index=true
    • http://namerunu.rf.gd/givimoguf.pdf
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_010229f525ec4c7295809164af7363fb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e226b618-6030-41e7-8f90-9c869b4f1de9/sketching_from_the_imagination_anime__manga.pdf
    • https://uploads.strikinglycdn.com/files/f3875734-0caf-45be-af85-cba464fc1265/2005_dodge_grand_caravan_battery_drain.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_off0000ee04.bin
9c51a55af0c44eb2c2af2c7e51f8d10ea56e8018ee15461fe3443f849342721e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 5200 bytes
font_01_sfnt_off0000ff9a.bin
7e57ea58749c62c15c182e26332f9ef39968b850eed8c9ff443511733d9e8b5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 12092 bytes

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