Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b559975bed8133…

MALICIOUS

PDF

66.2 KB Created: 2021-02-27 20:28:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 7d7f8776a2a182e6a6e3c2aeecfd0552 SHA-1: a84d3af65f223623950d4e5e536a097ac60684c3 SHA-256: e9b559975bed8133211c49b27b894489b6f107b32650e77b37f7456729698b18
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically phishing. The embedded URLs are likely used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/123?utm_term=heat+surge+adl-2000m-x+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479237/normal_60325553445fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486199/normal_601fd3b8499bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401703/normal_5fe221d81857e.pdfIn PDF document text
    • https://javekekowunafot.weebly.com/uploads/1/3/5/3/135324960/risidumi.pdfIn PDF document text
    • http://get3creditscores.info/diablo_2_charsi_imbue_guide4sidp.pdfIn PDF document text
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/fidasulumufane.pdfIn PDF document text
    • https://ruzamoga.weebly.com/uploads/1/3/4/7/134761687/dc09cb82.pdfIn PDF document text
    • https://duzobiwaroliwu.weebly.com/uploads/1/3/2/6/132696147/3aca1cab12c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418991/normal_601feb6669fc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450045/normal_6004a56375b68.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/75817926958.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/questions_to_ask_interviewer_teacher_job.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/kuxududamozafekoxoso.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/wayne_dalton_torquemaster_plus_installation_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/sage_one_accounting_tutorial.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/34208285366.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/55500031724.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_off0000bf3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3F 5480 bytes
SHA-256: a09fdb4d748109c27e88980e3f1939c96805e2f2e521a1eac89e58ca5835138d
font_01_sfnt_off0000d1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D4 12700 bytes
SHA-256: 21ed028d31ddcd631976baedffde7b27455e87a4fa244000b3301b68e5c9abab

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