Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea234b7f0f5f5f0…

MALICIOUS

PDF

84.0 KB Created: 2021-05-13 12:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 972290235317d48011fc759b44ad97b4 SHA-1: 6ec87c9a4d637740bb6437080c7b2fb31cb1621f SHA-256: cea234b7f0f5f5f0e0a2dad7663be63399ac671dd13c2cc80b93353df9efd412
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://baarspo.ru/strik?utm_term=how+to+use+mophie+juice+pack PDF link annotation
    • https://faxemidarasagim.weebly.com/uploads/1/3/4/3/134341424/1a20d23e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454436/normal_5fe607a192b9a.pdfIn PDF document text
    • https://venefosek.weebly.com/uploads/1/3/1/8/131871910/4204408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373508/normal_60571e6a510a2.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/rewidakumadamatibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426541/normal_6037b2d616c7b.pdfIn PDF document text
    • https://peroleliviw.weebly.com/uploads/1/3/4/6/134648746/zisotudowizu_moxelamubulude.pdfIn PDF document text
    • http://medesutaduj.22web.org/docket_legal_research_guide.pdfIn PDF document text
    • https://nubadofefir.weebly.com/uploads/1/3/4/7/134757625/6b27d28c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451930/normal_6026fad007e83.pdfIn PDF document text
    • http://dijawobal.iblogger.org/anticonceptivos_orales_y_alcohol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457005/normal_5fcbb96280075.pdfIn PDF document text
    • http://wagumoba.iblogger.org/6.0_powerstroke_oil_cooler_rebuild_kit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_293f158fed724ae4bbe93a841f33822e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ninasivol/horsenden_primary_school_ofsted_report.pdfIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_d03e76b774d64d038ed0f5b040404650.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/likerajatob/2782870037.pdfIn PDF document text
    • http://pimubejat.epizy.com/what_is_the_biblical_meaning_for_the_numbers_555.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/ronir.pdfIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_229df8030bb945028e954d60336c7de7.pdf?index=trueIn PDF document text
    • http://sejedusodumevu.epizy.com/hp_color_laserjet_cp4525.pdfIn PDF document text
    • https://ae9cd3fc-a2ed-4114-aa96-dd53a7e96ab4.filesusr.com/ugd/22cbe6_6a1a262d216f4161914b0657519db5f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/interrogative_pronouns_worksheets.pdfIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_053e3637f150431a87b43f52f2d35fb9.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 5012 bytes
SHA-256: 951695b797a57916f0ed2c233e3a543b3b90db09280862ad0a531281523853c0
font_01_sfnt_off00010d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D15 11548 bytes
SHA-256: 89744f298fbd3120d86b87cdd6c3b201aaa1537e161cd81890d05eea328ccf90
font_02_sfnt_off00013450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13450 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333