Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fae8e0f93df90be…

MALICIOUS

PDF

75.6 KB Created: 2021-04-08 15:40:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f5a7b72944bcdbc213e9c86ef9211956 SHA-1: becbbb1c65db75bdc5c9d5d973f860924e93e28f SHA-256: 3fae8e0f93df90be513994f448388b147842b92079f2dd2dcabee1a8a4655d54
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate malicious content, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=4+pics+1+word+level+2155+answer PDF link annotation
    • http://theharaka.online/my_water_heaters_pilot_light_went_outx1jfo.pdfIn PDF document text
    • https://cdn.sqhk.co/waxoxewanuvi/jihgij0/28055144243.pdfIn PDF document text
    • https://cdn.sqhk.co/zavipudajose/jd3KjjO/new_tip_calculator_iphone_shortcut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425010/normal_5fefb515d13b3.pdfIn PDF document text
    • http://eroganoficial.site/thetford_toilet_leaking_urinebonti.pdfIn PDF document text
    • http://promooffer.site/click_clack_moo_ready_to_ready704m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425924/normal_5fda3daad4d69.pdfIn PDF document text
    • https://cdn.sqhk.co/dojopaxitovi/jdsicNe/24506692006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486356/normal_5fcc12ff4f3dd.pdfIn PDF document text
    • http://coloradocustomelectric.com/14466518807pvje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403557/normal_606970043eb36.pdfIn PDF document text
    • http://giocodigital.website/fisijosebaxurusofonijikixue095.pdfIn PDF document text
    • http://xozonline.ru/dokasijonodisari917u7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479673/normal_602f505d14e2b.pdfIn PDF document text
    • http://devgame.design/data_science_jobs_salary_in_germany8k0vm.pdfIn PDF document text
    • https://cdn.sqhk.co/gagowuname/602iimb/photo_lyrical_ly_video_status_maker_download.pdfIn PDF document text
    • http://poverkavoda.website/18189795207oz19n.pdfIn PDF document text
    • https://cdn.sqhk.co/tegasipitif/uhiheih/lovupamiwaridekarafus.pdfIn PDF document text
    • http://navaram.online/63943893353m2uks.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_a3021e002ec64eaca8bdba77ee3e1eeb.pdf?index=trueIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_a5fa929ce9b04a5d96d75b0f1f700215.pdf?index=trueIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_582fd50343b84e07866abb36a25d090a.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_off0000e988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 5520 bytes
SHA-256: 5091b36152c65d7b8f4682084a0eb57770862444128709d17186405eb51f040a
font_01_sfnt_off0000fc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7E 10584 bytes
SHA-256: fc3f1071b72d9d18b5efa21d1150636d7395e80caecf30d34bbafa4770ac3b81