Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aec979be8cae9f5…

MALICIOUS

PDF

94.9 KB Created: 2021-02-25 01:39:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3aa88ea75378e4ac3c987df5de603f84 SHA-1: d423b51482218877b2cee2cb4428e5f4422b661e SHA-256: 9aec979be8cae9f54f1532a5f9cf6948abd841aea7659dbfb40db841e37d93cd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to disposable domains and redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded links, such as 'https://yafferge.ru/wix?keyword=hatchet+chapter+questions+pdf', are designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=hatchet+chapter+questions+pdf In PDF document text
    • http://sportplays.ru/33326994035aw3mz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418170/normal_6018616cd626f.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/suvisdnpjt.pdfIn PDF document text
    • https://zezonusadife.weebly.com/uploads/1/3/1/4/131410479/fc9719.pdfIn PDF document text
    • https://tumipipap.weebly.com/uploads/1/3/4/5/134598024/luruvalipebopobozad.pdfIn PDF document text
    • http://oneitstore.pro/47270140086jmqqs.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/nys_dmv_drivers_manual_chapter_4.pdfIn PDF document text
    • http://argo-tourism.com/swot_analysis_template_internal_externalt5kwi.pdfIn PDF document text
    • http://laxana.ru/vizio_e420i-a0_update_firmwarepac7i.pdfIn PDF document text
    • http://rubka.space/sibazatohht2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_5fd6449d168e9.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/tabela_de_integral_e_derivada.pdfIn PDF document text
    • http://5coupons.info/54606856789u39p1.pdfIn PDF document text
    • http://smartbright.club/fabizebefapgnlc.pdfIn PDF document text
    • http://dsv-trening.ru/macbeth_socratic_seminar_questions_and_answersmex6s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392444/normal_60061d3711e77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382620/normal_60000edc332a0.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/3b49423977538a.pdfIn PDF document text
    • https://koxowugazetumul.weebly.com/uploads/1/3/6/0/136015765/mixowokiwor-relureduniperil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/75819797837.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/blackmagic_intensity_pro_capture_card.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/enterobacterias_tratamiento.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_off0001396f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396F 5296 bytes
SHA-256: 92a8b052119fbab8e7b2ae6f954b1c7bec1125581fa5c87c1e2b0ed2959aa43e
font_01_sfnt_off00014b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B66 10240 bytes
SHA-256: a3ff8d7186afa47b43c422de3e22dec15c215b1a60a37c49db2dc311352fd3ca