Malicious PDF — malware analysis report

Static analysis result for SHA-256 28363a33753539bf…

MALICIOUS

PDF

126.6 KB Created: 2021-05-25 10:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 39b3617fd9e02e96af6a0d07d9cd7d76 SHA-1: b9d3b62e27cf50ff857bc8d9ad5d40b097b7e7a4 SHA-256: 28363a33753539bf733175bd3ba210fd061d4439af1238d3d76ab18431d1df10
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO link farm attack. It contains numerous embedded URLs, with a primary one pointing to 'vilenefex.ru/strik', suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, likely to manipulate search engine results or distribute further malware.

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 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.
  • 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://vilenefex.ru/strik?utm_term=super+mario+adventures+pdf PDF link annotation
    • https://kokopepexepu.weebly.com/uploads/1/3/1/3/131379351/dirutide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_600cf46eb244f.pdfIn PDF document text
    • https://fogoranamixite.weebly.com/uploads/1/3/5/3/135390362/tuvejinuxovilagi.pdfIn PDF document text
    • https://ludexibof.weebly.com/uploads/1/3/4/6/134638297/df31d.pdfIn PDF document text
    • https://fimezerix.weebly.com/uploads/1/3/4/4/134478386/rexasavom.pdfIn PDF document text
    • https://sisilodoja.weebly.com/uploads/1/3/1/4/131406442/6927975.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409801/normal_6002eba4de0d1.pdfIn PDF document text
    • https://bevifosadorafot.weebly.com/uploads/1/3/1/8/131856546/9594451.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490128/normal_5fe5ecdbf1c9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413462/normal_604610e9eaea7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465688/normal_5fe4145adccc7.pdfIn PDF document text
    • https://jejusutib.weebly.com/uploads/1/3/0/7/130740078/tejuxulu.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/savukojubusum/7346384207.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/how_to_cut_tongue_and_groove_with_a_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2546cfaa-bc1a-4f4a-8204-82dabc7fb0b4/90s_-_glitch_vhs__vaporwave_video_effects_editor_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/the_ugly_truth_book_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f943258-605d-45e4-9432-e2423ca5a004/estudio_biblico_de_la_historia_de_jose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ba3969e-1d3b-4c3a-9188-00754fd22ed0/family_life_merit_badge_requirements_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/cica_care_silicone_scar_sheets_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/the_blue_book_disability.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/figufukogigezijuved.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/93781848157.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_off00019157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19157 8560 bytes
SHA-256: 7dbcf14f9b2980f5b12989e75e4f3cffb0d3e2cbf73f2b2e7425d31fbfb0397e
font_01_sfnt_off0001adab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADAB 5320 bytes
SHA-256: c0c624fdaafdd2a5e18e48f5bf67e54a631756369b344fa2e20d69186d841087
font_02_sfnt_off0001bfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFB1 13508 bytes
SHA-256: fe651df5ea20f69f6bfcd0b975e2c7bb50f80c3a2efc886d5611619dd19e81f5