Malicious PDF — malware analysis report

Static analysis result for SHA-256 77efe7e8881c7a9c…

MALICIOUS

PDF

84.4 KB Created: 2021-06-11 09:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e75b777af881e3cc3df43cb2848fc120 SHA-1: cf8424b092b2d3e2d3b85e43d519815ed3edd976 SHA-256: 77efe7e8881c7a9c5b4233c580b31f532ae1030cbdf74d0c911b2f89e801481b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to direct users to malicious content or phishing sites. The primary IOC is the URL 'https://synerhu.ru/pbw?utm_term=100+meter+sprint+game+unblocked', which is embedded within the document and likely serves as the initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://synerhu.ru/pbw?utm_term=100+meter+sprint+game+unblocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5fd0a494667b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473916/normal_605255d9034d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499329/normal_5fdfa90b2d3a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423454/normal_5fff250de6fdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471719/normal_60402c579d580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449781/normal_60223622579d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404529/normal_600fca206f636.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379720/normal_5fcd03d819705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481280/normal_60119dcaeb721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368467/normal_603eb70c4de5e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4488322/normal_60b75e26daece.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469837/normal_60515f2fb5374.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/871b7db1-a00e-482d-b204-3bdc883903d9/67351842772.pdfIn PDF document text
    • http://dobifapig.pbworks.com/w/file/fetch/144477339/37366303557.pdfIn PDF document text
    • http://vojewukejiwu.pbworks.com/f/driver_booster_7.1_pro_key_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f168fcad-8a1a-4719-9dd2-1e0753719f05/6711847848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec82244c-87f7-42c0-987d-8bb890ec80ab/nursing_diagnosis_handbook_free.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/w/file/fetch/144464265/nufonulovevag.pdfIn PDF document text
    • http://xetuduju.pbworks.com/f/rafafekiruromo.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144426978/97737793848.pdfIn PDF document text
    • http://vekunadugaj.pbworks.com/w/file/fetch/145055325/sipugutulidemozorolo.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_off00010ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC8 5696 bytes
SHA-256: 3b5b3b24c0aabdca950b1663d478510b2d50ebf6d0e8ac28a201a0d9b96270b7
font_01_sfnt_off00011e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E08 11392 bytes
SHA-256: af7ce5d450617f6545543517ba30ae6a9c9f90b02f679c9b43ddebdb8aa9ad0c

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