Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12ccd8c5a698f97…

MALICIOUS

PDF

77.1 KB Created: 2021-04-19 18:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e7f5694cb8e4eb00a806fa0b4ace4b0a SHA-1: 121def29683e8f05c1fc199580f34e87df68af55 SHA-256: b12ccd8c5a698f975138077ed392dc150ec0911db12dac1ca54a41508664d251
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with at least one, 'https://leonvi.ru/strik?utm_term=1.+organic+chemistry+is+the+study+of+compounds+containing', being a potential phishing or malware distribution point. The PDF structure and embedded content suggest it's designed to redirect users to malicious sites.

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://leonvi.ru/strik?utm_term=1.+organic+chemistry+is+the+study+of+compounds+containing PDF link annotation
    • http://fukoxonezadanom.22web.org/cs_camscanner_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371498/normal_5fe34997e1dab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490377/normal_6032f146903c3.pdfIn PDF document text
    • https://juxilejaguzu.weebly.com/uploads/1/3/4/4/134404551/3732002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491665/normal_6041eb256b378.pdfIn PDF document text
    • https://galifejamadex.weebly.com/uploads/1/3/0/8/130814644/ee330d0a880eb1.pdfIn PDF document text
    • http://ligexekena.mywebcommunity.org/tutumun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383797/normal_606b474d588c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384154/normal_603ce29c77b84.pdfIn PDF document text
    • https://feredelulewijun.weebly.com/uploads/1/3/2/6/132681536/fonegixetulofav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413346/normal_6000f5360836c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_6069b717770c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jiboleramar.epizy.com/lisa_coffee_meme_template.pdfIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_228293b6cab44a8abcd15eff23d68ba1.pdf?index=trueIn PDF document text
    • http://litosivofojolid.rf.gd/7918270858.pdfIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_fed25014bfdd45d18f38c76725b51a18.pdf?index=trueIn PDF document text
    • http://fowakoleviwamop.onlinewebshop.net/jodabekogewami.pdfIn PDF document text
    • http://dibezage.epizy.com/xusirubukaxufeturosenut.pdfIn PDF document text
    • http://turepebixorara.rf.gd/womiduzuziwadadawu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 5628 bytes
SHA-256: b23104d2e90a8a3ec39b1c24a4f6eccec563cd0d8ef5371fafca8047ab652478
font_01_sfnt_off0001008b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 11044 bytes
SHA-256: 8f8f951625be75e25bdd4a3ef12a6a7b4a15dae8bf79a90320dc2a9ccfb63736

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