Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b9121339574775…

MALICIOUS

PDF

95.1 KB Created: 2021-03-09 21:28:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: aae340b2eaef95baef71382fdef92a56 SHA-1: 6a1478de2e3e0a060b89812b7a586570ac7f4e90 SHA-256: 51b91213395747751bf7729711dc678eac9b47ffd8675ef09f23dd4624efe959
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or direct users to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate a phishing or SEO spam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/award?keyword=albuterol+davis+pdf PDF link annotation
    • https://nagipabusodeza.weebly.com/uploads/1/3/1/4/131453106/besig-ravapixavesep.pdfIn PDF document text
    • http://jevafurevozu.mygamesonline.org/fender_mustang_2_footswitch_schematic.pdfIn PDF document text
    • https://nikigefewava.weebly.com/uploads/1/3/0/7/130775032/rurosususabelebokin.pdfIn PDF document text
    • https://pupadidaf.weebly.com/uploads/1/3/0/8/130873798/d8e143a807fb.pdfIn PDF document text
    • https://pedexanagokol.weebly.com/uploads/1/3/4/6/134635549/pexuwizakevura.pdfIn PDF document text
    • https://xunasumip.weebly.com/uploads/1/3/2/6/132696393/866251.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420906/normal_5fcf61eacc627.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/93392176253.pdfIn PDF document text
    • https://mubajodopiwal.weebly.com/uploads/1/3/1/4/131454521/bexebixiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405654/normal_6033045c0dc6c.pdfIn PDF document text
    • https://dabomisefeb.weebly.com/uploads/1/3/0/7/130775205/8101200.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/97e74342-a9cb-45e6-8582-5105da27e5ae/family_law_attack_outline_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af0bca24-d63a-4c79-b097-68283fbe7a21/goldman_fristoe_test_of_articulation_3_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e6220cb-72ae-47e6-9971-351e0e55be9e/dumij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc370177-32c0-43bb-b67a-47cb275bee18/what_are_the_types_of_electrical_connections.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a736dd3-4f06-4741-ae00-05d04e81662a/dsc_power_832_pc5010_installer_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8266f5f5-c706-4d4f-8350-b5278101c18d/compare_the_magnitude_of_centripetal_force_cp_and_centrifugal_forcecf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfe20b27-b96c-41ef-8a36-d7e84dc2d60a/kenmore_70_series_washer_will_not_drain_or_spin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7706c235-b4b4-4877-af40-006207acb09f/jipetinonemesudovugud.pdfIn PDF document text
    • http://xasagode.myartsonline.com/active_and_passive_voice_worksheets_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c9618e0-3e01-492b-b9a6-5d4b2196dcff/89776441502.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_off00013922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13922 5224 bytes
SHA-256: 273938a918f6436e405307250f08525185e50688f043d7bc758ab602ba6066f1
font_01_sfnt_off00014af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF6 10756 bytes
SHA-256: bb765200c81c9bdaf8d29bda2ce2a1cc3571b38d452ec541662478ecd67059e5