Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bff85c21320ee6…

MALICIOUS

PDF

75.8 KB Created: 2021-06-02 13:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5d586c9d309d5ecd491abcef199e5517 SHA-1: 6ee13d0a5dfed708b359054859b327fd3dc36d3b SHA-256: 98bff85c21320ee61c1f6bbd94cd0d2eafd5b7e9ea4a7e9563d3e8facf4992a0
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm or phishing campaign. The primary malicious URL identified is https://nomylo.ru/pbw, which is likely used to redirect users to a malicious site. No scripts were extracted, but the PDF structure itself is indicative of a phishing or spamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nomylo.ru/pbw?utm_term=ejercicios+con+el+presente+perfecto PDF link annotation
    • https://xefakebeka.weebly.com/uploads/1/3/5/9/135993821/vivesolijekabowit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426424/normal_603b2e20b8528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394071/normal_60096566e6c8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473030/normal_5fcbc6b4f11e3.pdfIn PDF document text
    • https://memabalizova.weebly.com/uploads/1/3/4/4/134490842/4282288.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469378/normal_603ffa0247684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477137/normal_601de6c41ae41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416659/normal_5ff79379eb4a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377109/normal_5ff0018c46464.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464525/normal_5febffd730766.pdfIn PDF document text
    • https://megeludok.weebly.com/uploads/1/3/4/5/134595993/nuxoga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454575/normal_6000ff4a79b9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402504/normal_5fe59fb6b12ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446395/normal_6037e1a380fdb.pdfIn PDF document text
    • https://wotewaga.weebly.com/uploads/1/3/4/6/134615540/rudegeturejivole.pdfIn PDF document text
    • https://sewogasi.weebly.com/uploads/1/3/1/1/131163712/varemabor.pdfIn PDF document text
    • https://xarotiwarez.weebly.com/uploads/1/3/1/4/131406970/d01d3.pdfIn PDF document text
    • https://manesufepal.weebly.com/uploads/1/3/1/3/131381078/pokiwasagituna.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464052/normal_5fe3bd654ccf2.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/0642b3be-c328-4a03-bfac-5ecc89255ea8/2003_vw_passat_transmission_fluid_check.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7ccfc57-58f2-4f17-9181-8beded847c70/fantastic_mr_fox_plot_synopsis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8705d6b1-ffd2-43a1-8d65-6a98778745c9/77550042898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4217f50-5fc7-436a-ba8c-b4ca64304954/onkyo_tx-nr626_bluetooth_not_available.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3180fcee-d7f4-4105-ae40-9cc92c9e4e32/what_does_autonomy_definition_mean.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_off0000e647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 4832 bytes
SHA-256: cd3e2a8bb002145a41a86230fa183764f14571c68d44eaab88684a14eb827058
font_01_sfnt_off0000f6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 12776 bytes
SHA-256: c02a9d454b30e855e1774b2180153d22e0f2d99d4a75e9835ccabf766fd8b7c5

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