Malicious PDF — malware analysis report

Static analysis result for SHA-256 933c4d9504df2651…

MALICIOUS

PDF

75.8 KB Created: 2021-03-24 13:35:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d8a2cf89476a3e9ed9d772caa4a4239e SHA-1: 8541b17608e70626f5b43ac9944e270d76affc08 SHA-256: 933c4d9504df26512829d709fbda440b36260f8a67878b22755e2a61cab61bc8
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to potentially malicious redirectors, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The primary malicious URL identified is dafemum.ru, which is used in conjunction with a keyword that suggests a phishing or scam attempt. No scripts were extracted, but the structure and URL patterns are strongly indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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 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.
  • 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://dafemum.ru/wix?keyword=cambridge+latin+workbook+answers In PDF document text
    • http://vojemodipu.sportsontheweb.net/fuzipagaloremebuz.pdfIn PDF document text
    • https://sevafigetof.weebly.com/uploads/1/3/4/9/134902911/49d3adaba0a.pdfIn PDF document text
    • https://dimejozetef.weebly.com/uploads/1/3/1/0/131070151/3298203.pdfIn PDF document text
    • http://jebebixazonutug.mypressonline.com/83703301616.pdfIn PDF document text
    • http://wavapivanuf.scienceontheweb.net/ea_sports_ufc_2_pc_download_crack2games.com.pdfIn PDF document text
    • https://lufuwoxataj.weebly.com/uploads/1/3/1/3/131379696/42edda99f88ba8b.pdfIn PDF document text
    • http://sarkife.site/disorderly_conduct_charge_nyx93x6.pdfIn PDF document text
    • https://rawadawopi.weebly.com/uploads/1/3/0/8/130874142/xubopejezukokubi.pdfIn PDF document text
    • http://wwbook.org/how_to_be_an_emergency_foster_parentod6dp.pdfIn PDF document text
    • https://vokewubepil.weebly.com/uploads/1/3/4/4/134443825/nuzalepopajazixida.pdfIn PDF document text
    • http://b0xberry.online/mystic_messenger_jaehee_route_guideibx77.pdfIn PDF document text
    • https://lopamazaveseku.weebly.com/uploads/1/3/4/6/134643240/014a316a5c72a1.pdfIn PDF document text
    • http://blablablacar.online/bangalore_days_dulquar_salman_ringtone5yq17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/283654f3-f6c4-4dcc-9f43-eeaaa3380764/82909808094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82265a2b-1228-49c2-88b9-2b517695fe6e/bavuwitakel.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/animation_techniques_in_multimedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4603f65-c32a-4a5c-9efb-eee661ae9703/mcgraw_hill_connect_student_login_lausd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfffd0d9-01d6-422d-8a7c-5380d8a22bfa/gevepotopagiditagasexor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5da1d1c-5a5c-400f-9869-40109e9e5ce2/26290136683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf5ff2d5-9840-4a25-8336-1246a6a42f61/79560883953.pdfIn PDF document text
    • http://ferodibev.onlinewebshop.net/79791778533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b3a64b-88d0-42fe-84d6-9c15fe5f83a9/why_is_bible_study_so_important.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_off0000e7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B0 5344 bytes
SHA-256: 8344bd9d7daae95d2f7ee719d6a213551fc85e26b4dc6546aa0b2c0f3711f0c2
font_01_sfnt_off0000f9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 11628 bytes
SHA-256: 535c8805a2089549cadbd1c45122931bf0021d7817eb5dc174c7cdb2a7c83802