Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3f0afa1f2641db…

MALICIOUS

PDF

72.7 KB Created: 2021-06-07 13:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: da63c04319110aaeca0d9345fca011a7 SHA-1: cc682866ccee4a0ad6989bdddc0e641e94fad76c SHA-256: 4f3f0afa1f2641dbcfb3626f779be28e3a625825f21def76f7c8a2d37871a1d2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm, potentially for SEO manipulation or to host phishing content. The presence of numerous links on disposable hosting services further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://medvor.ru/pbw?utm_term=educational+psychology+phd+uk PDF link annotation
    • https://tufezojaf.weebly.com/uploads/1/3/1/3/131384552/xoribedufisonaz.pdfIn PDF document text
    • https://pejejejepo.weebly.com/uploads/1/3/2/6/132682076/jewezegezep.pdfIn PDF document text
    • https://ruwagifixub.weebly.com/uploads/1/3/4/0/134013037/2821262.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/eb9b173e9a1f61.pdfIn PDF document text
    • https://gubijebe.weebly.com/uploads/1/3/1/4/131483267/3884038.pdfIn PDF document text
    • https://refaxoke.weebly.com/uploads/1/3/4/6/134602084/tomerotoke_pemizaza_pixekeminurug.pdfIn PDF document text
    • https://noxubesepa.weebly.com/uploads/1/3/7/4/137499292/jewedamegavabijufejo.pdfIn PDF document text
    • https://rofowijajexer.weebly.com/uploads/1/3/4/4/134476616/c32a356765bf45.pdfIn PDF document text
    • https://zitolibozix.weebly.com/uploads/1/3/4/0/134040523/e0334ea.pdfIn PDF document text
    • https://wevepoguf.weebly.com/uploads/1/3/4/7/134717949/4072263.pdfIn PDF document text
    • https://jipaxebuperiw.weebly.com/uploads/1/3/4/7/134751602/perokimikojemu.pdfIn PDF document text
    • https://wadabugijiri.weebly.com/uploads/1/3/0/8/130873870/genof.pdfIn PDF document text
    • https://vumiwexazowonig.weebly.com/uploads/1/3/4/6/134680765/tudomavevofe-luxasibave-bunape.pdfIn PDF document text
    • https://sopowifumerage.weebly.com/uploads/1/3/4/3/134355846/5280056.pdfIn PDF document text
    • https://dolilufaxeni.weebly.com/uploads/1/3/2/6/132683246/ditog_zidanigagozo_navebifabame.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://togusan.pbworks.com/f/present_progressive_spanish_exercises.pdfIn PDF document text
    • http://vibevekofano.pbworks.com/w/file/fetch/144426219/sorofop.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/w/file/fetch/144483915/961923197.pdfIn PDF document text
    • http://tujedet.pbworks.com/w/file/fetch/144549348/92816642816.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/99529903831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69eb66fa-3812-4caa-b61e-5ea75798e771/31551356052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aafda0e-058d-4670-b40f-371b72aaf7de/33250375055.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_off0000dfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE1 5364 bytes
SHA-256: 518edef55d67614a9fc7ac390e5c8fb7f969beda10f776fb1eaa1ca6c022d266
font_01_sfnt_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 10224 bytes
SHA-256: 170146737d2203eb43ac40b5db3814f1f3543adfe94d05933b7863ac3685a3c1