Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a137aaf2b599bc3…

MALICIOUS

PDF

138.2 KB Created: 2021-03-17 04:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 57bdae0e4611c64fdecd8d8dcbb275f2 SHA-1: 90e084fe9c0bcaacf036c7bd14352431801e5492 SHA-256: 9a137aaf2b599bc3e029fca6da1f59e622804629ed00f29d911bf627620646b4
186 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to direct users to malicious content. The primary malicious URL identified is https://xezojetit.ru/award?keyword=restoration+and+augustan+age+pdf, which is likely part of a phishing or content-scraping scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/award?keyword=restoration+and+augustan+age+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5fd252f068406.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491671/normal_602505efd2b90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369796/normal_5ff98c55ed79c.pdfIn PDF document text
    • http://tevazodufo.iblogger.org/kisus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475739/normal_5fd95ad8adbc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368504/normal_5fedec6342ef0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421214/normal_6045c91146cd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_60246f84c4d4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454673/normal_602c9e4f4b168.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420250/normal_5feda4030ce75.pdfIn PDF document text
    • http://zulukaruwi.22web.org/demiwotafugokobabiv.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/8a577acc-9dcc-4bc4-8ebf-6c7fc338a12f/epson_workforce_840_printer_cartridges.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_dc31eebc9c1f4e47b9cbd07ce07bc849.pdf?index=trueIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_2c96f2ee7cec45a0a1f0528083c0f252.pdf?index=trueIn PDF document text
    • https://30fe55a9-f0c7-4aec-9bf5-b9d2225d99a8.filesusr.com/ugd/c4a51e_d66faf34a7764b0b9b931e622a4c2769.pdf?index=trueIn PDF document text
    • http://nifopufu.epizy.com/from_facebook_high_quality.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/xamagobubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56bce106-18cd-4388-862e-c4ac599f5f85/puxagejonuluxoxapoz.pdfIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_c37b77ad7f374e058369b8f687e730ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/eduardo_costa_amor_de_violeiro.pdfIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_bbe3a8973b4b423dab03984790c4fd3b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kaxukok/refafav.pdfIn PDF document text
    • http://pimibini.epizy.com/talimuwiputefalotiwizi.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_off0001e1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E1C1 5184 bytes
SHA-256: 7a826960544e992a16636487c612409c0f4d1bf608e5430d80181db234401d63
font_01_sfnt_off0001f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F37B 12088 bytes
SHA-256: 1b06b887ef94cbb35a52dd98a890f4a7d4c9636335d7523aa0c105c2f512f549