Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2f237a82334cc6…

MALICIOUS

PDF

72.7 KB Created: 2021-03-13 19:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fa74ca7ac22c8371b123d3e67f5767bb SHA-1: 6cca5b1943bedabe9cb325baad0c5bfff73c1621 SHA-256: 7a2f237a82334cc66dd8235e888b4f20b2c903b96bdaaa4fdc531396b7147be0
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified as a link farm, likely intended to redirect users to malicious or deceptive websites. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document likely serving as a lure to a phishing or malware distribution site. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through deceptive content and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://seumenha.ru/award?keyword=cesarean+section+steps+pdf PDF link annotation
    • https://cdn.sqhk.co/kigoxeni/dgcoaXD/world_cup_2018_table_calculator.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/37322859701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376599/normal_603298686b996.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/15799542320.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/iWgj8kX/spy_tactics_in_the_revolutionary_war.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/AyZjbdK/ginapa.pdfIn PDF document text
    • http://viwavidif.getenjoyment.net/83378617143.pdfIn PDF document text
    • http://kakolamilasaru.medianewsonline.com/will_attorney_near_me_free_consultation.pdfIn PDF document text
    • https://cdn.sqhk.co/woluzadeviv/ihgff5I/buzz_lightyear_wings.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420766/normal_6035c91c0108f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423471/normal_5fd813d598aee.pdfIn PDF document text
    • http://juxoxelobonoje.22web.org/pojixovog.pdfIn PDF document text
    • http://morikulifitoj.22web.org/real_estate_letter_of_intent_template_free.pdfIn PDF document text
    • http://vudasuti.mygamesonline.org/64664156620.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xunudijumo.myartsonline.com/wunutokefeloso.pdfIn PDF document text
    • http://detuzojezil.rf.gd/73757172553.pdfIn PDF document text
    • http://tagugatukosag.epizy.com/how_to_cite_references_in_apa_format.pdfIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_7aa885df68c5457aa1100089dcee1d27.pdf?index=trueIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_8511bd1d1d1a4b50b80232cbb66505e8.pdf?index=trueIn PDF document text
    • http://rowigos.rf.gd/37776226684.pdfIn PDF document text
    • https://medlineplus.gov/cesareansection.htmlIn 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_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 5024 bytes
SHA-256: 75a66ceecf38c6aa0a0a365eb049ad1471f8ffa5c94ec8042f5f00a50ea263fe
font_01_sfnt_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 10316 bytes
SHA-256: 97360006c5f308d70eee8996d9f4c393022eda56a9b92a73cef9617d46b40162

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