Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5fa1a3a4c9914f…

MALICIOUS

PDF

64.6 KB Created: 2021-01-01 08:54:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 28d7895858e414fd688796001981c89d SHA-1: d3c81c1e40c0853fc8ffb923ddf3680a81b0cb45 SHA-256: 0c5fa1a3a4c9914f5276e239385c21c243fe6c469fae6eba6f76697b1c4d12e5
214 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are identified as part of a link farm or redirect to malicious infrastructure. The document body, though heavily obfuscated, contains text related to "unblocked school games impossible quiz," suggesting a lure to attract users to malicious sites. The presence of a malicious redirector link and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=unblocked+school+games+impossible+quiz In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f895faf2216e.pdfIn PDF document text
    • https://cdn.sqhk.co/xotalawad/33gjO3G/zakurezidarigoxifagi.pdfIn PDF document text
    • https://fexolemigelewi.weebly.com/uploads/1/3/4/2/134235379/razewakunusa-kewabemifi-runopupiku-tiwap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412758/normal_5fdfdda7a8fd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410459/normal_5fc0bb504caba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372104/normal_5fde6688bbc81.pdfIn PDF document text
    • https://totuseki.weebly.com/uploads/1/3/5/3/135322554/nubujirobidesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5fe907e2c5a97.pdfIn PDF document text
    • https://cdn.sqhk.co/nurofiwele/jhaQKjh/bike_racing_game_for_android_free_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fomavulobet/ddghlhj/types_of_nail_drill_bits_and_uses.pdfIn PDF document text
    • https://cdn.sqhk.co/wevujawej/X5qlmub/37643117617.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/051e92be-c8f7-46f3-bb1b-0ee06b71212e/direct_flights_from_florida_to_charleston_sc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a12b3b2a-2c6c-4ea0-8336-e7553ae55cb4/trabajo_social_en_chile_sueldo.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_off0000c06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06C 5760 bytes
SHA-256: 4a21a3aea06cccb808579d9f3222b24d555b10b1e6ec36a902ead40eed69d5df
font_01_sfnt_off0000d3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E1 9848 bytes
SHA-256: 17816eadf3c0df92a3b756ef68e2b23061ef1e64452b8ff7814581c2ed8363c7

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