Malicious PDF — malware analysis report

Static analysis result for SHA-256 4965ff40bf6c4da1…

MALICIOUS

PDF

83.4 KB Created: 2021-04-06 17:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 33bf1262df92c20e6635589e67cf285b SHA-1: 66f4f42250676d2c0d45d1235a7c5552c5c4fc94 SHA-256: 4965ff40bf6c4da1963dc6f7e05bdc63ccc4cf2846f3ed54831ff8f963f1c700
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent through URL redirection.

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://soxebez.ru/award?keyword=arpeggios+from+hell+sheet+music+pdf PDF link annotation
    • https://xaxidotuviw.weebly.com/uploads/1/3/0/9/130968933/083f18.pdfIn PDF document text
    • https://kawikixefi.weebly.com/uploads/1/3/5/3/135388441/8537004.pdfIn PDF document text
    • https://pilinasovoda.weebly.com/uploads/1/3/4/1/134132167/lazitusopapipo_tapapap_duximadavim_xakomapuni.pdfIn PDF document text
    • http://jijimaxugixu.22web.org/collaboration_interview_questions_and_answers.pdfIn PDF document text
    • http://buwubaled.mywebcommunity.org/63715603442.pdfIn PDF document text
    • http://fokuwezowixo.iblogger.org/30609481424.pdfIn PDF document text
    • https://jejenami.weebly.com/uploads/1/3/4/6/134684972/9306704.pdfIn PDF document text
    • http://sawozuduridab.iblogger.org/biwipugabe.pdfIn PDF document text
    • https://puvexamufo.weebly.com/uploads/1/3/5/9/135971660/e458ae5.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
    • http://bavodokebak.rf.gd/national_geographic_magazine_uk.pdfIn PDF document text
    • http://kezakodik.rf.gd/kotejojovonebop.pdfIn PDF document text
    • http://fizojigijuzad.epizy.com/what_is_canadas_criminal_justice_system.pdfIn PDF document text
    • http://valapapiwusujeg.rf.gd/toverefezomijane.pdfIn PDF document text
    • http://dasamixatile.epizy.com/11044691760.pdfIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_49381186ae8d44d5b88b8354b86c8168.pdf?index=trueIn PDF document text
    • http://nezepipiniwaj.rf.gd/riverimoluguzudenodo.pdfIn PDF document text
    • http://vorisenunajix.myartsonline.com/68692462215.pdfIn PDF document text
    • http://vibirokudod.myartsonline.com/zofoseko.pdfIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_0d4fc74e58dd4669a3e17ffaf44663f7.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_off0000f909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 5124 bytes
SHA-256: 42e668d64dfe1b86e1ce4d2a44113fb0d0129b1437337af4c93f48532e440413
font_01_sfnt_off00010a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 11672 bytes
SHA-256: 9db471c9723bdecfa8e5bf0b6ed35b66f3f8d1ed8ad4370174e30cc628bd0c61
font_02_sfnt_off00013292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13292 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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