Malicious PDF — malware analysis report

Static analysis result for SHA-256 88cf2b38d7b74898…

MALICIOUS

PDF

81.6 KB Created: 2021-03-27 14:28:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8aab24a295b2a2d6958d6e5082de5d1b SHA-1: 7a2b4d36746c7fccb08a713627958bd1c2779375 SHA-256: 88cf2b38d7b7489849c13f6a96810dad2cd8b40cd9fb89a52e167fa89da19c26
184 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a critical heuristic firing indicating redirection to known malicious infrastructure. The ML classifier also flagged the PDF with high confidence. While no scripts were extracted, the presence of numerous links, including those on disposable hosting, strongly suggests a phishing or malware distribution attempt.

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
  • 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/strik?utm_term=harman+pellet+stove+maintenance In PDF document text
    • http://jedilinosur.mywebcommunity.org/soladu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401714/normal_60159d3fe1dd5.pdfIn PDF document text
    • http://avto-trokot.xyz/zeganubekeveberexid544ea.pdfIn PDF document text
    • http://mogimetekojubar.scienceontheweb.net/love_and_respect_conference_michigan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409238/normal_605ef22c5ca86.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420752/normal_600a0bf87632c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faxiruvud.myartsonline.com/baxetidibepibokuk.pdfIn PDF document text
    • https://90b6428a-f85d-4fb4-90f7-6cca40d0dc23.filesusr.com/ugd/55544c_7835da07a2724ec0b610760b6c819830.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/what_tools_do_you_need_for_carpentry.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/13150830875.pdfIn PDF document text
    • https://14e2190e-1c7c-401b-bdd1-4e50d95f8180.filesusr.com/ugd/62a579_ea7c95f9e2924ed1b8bccff8295c3b78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/691999b7-6260-4399-a332-056564960e47/mi_planta_de_naranja_lima_english.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/etymological_meaning_of_education.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2486d0e-2076-47ed-b7e7-5fc4686a8a9a/5500087301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bc35d23-3575-4eba-b250-04248758db47/how_much_does_it_cost_to_lift_a_pt_cruiser.pdfIn PDF document text
    • https://fa3f2985-242d-4a4c-93c0-6adbfb259eaf.filesusr.com/ugd/8dbe7a_b11522e78b4348ee98d9521f968f5681.pdf?index=trueIn 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_off000102eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EB 5100 bytes
SHA-256: 499a6faac85da0c887c5cc48596c1f6943087437f6a6a00bef10630d49f2d44d
font_01_sfnt_off00011430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11430 10948 bytes
SHA-256: c81671cee54b8c4dce1b61551e0927d1101f8d11f6dad7627f368d090c871507

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