Malicious PDF — malware analysis report

Static analysis result for SHA-256 579604d190a0aed7…

MALICIOUS

PDF

80.4 KB Created: 2021-03-17 11:07:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c90869f8729ecf5b7cb749f9192a72ed SHA-1: 617596692349e189882bbfad9f5d3f0d8e0c87b2 SHA-256: 579604d190a0aed7dc74792e54dca99b8ce40c8b7bc571273998d79f03207a3b
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a domain associated with phishing ('jottigo.ru'). The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'chain of custody evidence pdf', likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/award?keyword=chain+of+custody+evidence+pdf PDF link annotation
    • http://reznitskygallery.com/basic_tumbling_skills_for_cheerleadinge3q7t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386829/normal_601823b4d27fb.pdfIn PDF document text
    • http://tazikuruwuwozu.22web.org/25601012279.pdfIn PDF document text
    • http://tefituguj.iblogger.org/2003_saturn_vue_fuel_filter_location.pdfIn PDF document text
    • https://garujidizog.weebly.com/uploads/1/3/1/3/131398488/kukasudogofolazito.pdfIn PDF document text
    • http://sexugaweguko.iblogger.org/67377379185.pdfIn PDF document text
    • https://simipupipez.weebly.com/uploads/1/3/4/7/134716676/vurozaru_bupuwemexupi.pdfIn PDF document text
    • http://ludunulanara.iblogger.org/luminozetuxojetegatavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481985/normal_5fdb3d00c964f.pdfIn PDF document text
    • https://wujenorap.weebly.com/uploads/1/3/5/3/135322769/8eb9d8736c5e3d.pdfIn PDF document text
    • http://misstourist.info/44172733071t3zzi.pdfIn PDF document text
    • https://tagosijotibaza.weebly.com/uploads/1/3/1/4/131407106/jililewi_wipujowetuwoxaw_sokawuxumixa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/30037dc4-110d-4617-8cc5-e30670e5c577/67973337977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4b72f10-a1c4-4cda-9df5-44de512002be/vanedonexixojigetabebo.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/wojidavesolafekunobabosu.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/technical_engineering_report_pee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7614c7-bc78-4734-bce8-2c0c4c58ea90/words_that_start_with_spl.pdfIn PDF document text
    • http://nofexezizakizu.rf.gd/advanced_excel_in_bengali.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 5184 bytes
SHA-256: e4a6a2ebbaeb36563eab0cf185818e002df2ac1e51960de9740fa7d29320e677
font_01_sfnt_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 10672 bytes
SHA-256: 339dcddd182ed35f446a218ad939400543665ebc14ab423ff3a9fe2508d97957
font_02_sfnt_off000125df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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