Malicious PDF — malware analysis report

Static analysis result for SHA-256 0280b58bcc2fb64e…

MALICIOUS

PDF

83.0 KB Created: 2021-02-28 08:49:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8af24dcb6b7e135421d28f265385e613 SHA-1: 01b25d51f8041a8f8c49902a0e808aec8d97cc59 SHA-256: 0280b58bcc2fb64e450dd80f899ffe7a62eefba58cabb8f35f0deacf1d6f7c97
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains, with one URL containing a suspicious query parameter. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=will+genie+intellicode+work+with+liftmaster PDF link annotation
    • http://jewivodapujoje.iblogger.org/certified_mail_form_3811_instructions.pdfIn PDF document text
    • http://eu-study.ru/financial_reporting_analyst_salary_torontopjh13.pdfIn PDF document text
    • http://limecash.xyz/53578875834xv249.pdfIn PDF document text
    • https://lesinaxalurivox.weebly.com/uploads/1/3/1/3/131398335/venozo.pdfIn PDF document text
    • http://talakam.space/acknowledge_of_receipt_email_templatea6ozf.pdfIn PDF document text
    • http://yellownatural.space/how_to_reverse_data_order_in_excel_graphn1jp6.pdfIn PDF document text
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/dd3c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367921/normal_6004f3aad799b.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/jdvohbW/kexiferixev.pdfIn PDF document text
    • http://fazoluniguket.iblogger.org/scp_containment_breach_save_game.pdfIn PDF document text
    • https://nutarubanamu.weebly.com/uploads/1/3/4/5/134528768/xuzotodudoge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493589/normal_5fdef06408972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_601c62767e9de.pdfIn PDF document text
    • http://erkutungotu.com/server_2016_remote_desktop_services_manager_missingukuy4.pdfIn PDF document text
    • http://vkrowl.com/inventario_de_intereses_de_karl_hereg1lhn.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/nsgFhca/pet_friendly_bubble_machine.pdfIn PDF document text
    • https://kadamoxezegawuf.weebly.com/uploads/1/3/4/3/134347408/be048c0b61.pdfIn PDF document text
    • https://liberiloro.weebly.com/uploads/1/3/4/5/134589576/pojaxulez-xurevojuwu.pdfIn PDF document text
    • http://fionainthefield.org/the_birchbark_house_chapter_1_summary66jp2.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
    • http://nolivajujereram.rf.gd/addresses_in_canada_format.pdfIn PDF document text
    • http://kitukogoxav.epizy.com/66809021985.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_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 5392 bytes
SHA-256: 493db9b72c11f64d2f8c83265bca967cad937ba0be89bd7be96290ee7327a0f1
font_01_sfnt_off00010bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDF 10892 bytes
SHA-256: 084d38940f2fad197dba318a52d04ee0e8de99912adf7954ab5a9fa8e5ef5e9a
font_02_sfnt_off00013096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13096 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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