Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4791e3cd8eebb8…

MALICIOUS

PDF

81.2 KB Created: 2021-03-20 18:26:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: eee71d6273c3bc83df3010f680f554be SHA-1: 65451444aba9d6d0e77665149699a89b8ae9a26a SHA-256: fc4791e3cd8eebb8bbc729d655552c15374b4e32282ecad8fc0e065a546028b3
126 Risk Score

Malware Insights

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

This PDF file is classified as malicious, likely a phishing attempt. It contains numerous embedded URLs, including one pointing to 'jumiwimov.ru', which is likely part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'anglican hymns ancient and modern pdf'. The presence of multiple disposable hosting links further supports a malicious intent to distribute phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/award?keyword=anglican+hymns+ancient+and+modern+pdf PDF link annotation
    • https://mapatujil.weebly.com/uploads/1/3/1/4/131454051/bunewewawujus_mubogupune_nezilu.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/PAg4Khg/21525453541.pdfIn PDF document text
    • https://kibalenujodoziz.weebly.com/uploads/1/3/0/7/130776895/gasuletiberupij.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/gisiihc/30943369531.pdfIn PDF document text
    • https://wuvumivew.weebly.com/uploads/1/3/1/4/131410662/e7244097304.pdfIn PDF document text
    • https://cdn.sqhk.co/retirijozi/yhbjhhe/popular_programming_languages_and_their_uses.pdfIn PDF document text
    • https://vuginavoji.weebly.com/uploads/1/3/0/7/130775358/063a1.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/gjOgriN/57576313521.pdfIn PDF document text
    • https://gakofalu.weebly.com/uploads/1/3/1/6/131636889/tokomi.pdfIn PDF document text
    • https://madisilusira.weebly.com/uploads/1/3/4/3/134321428/busixejov_jajotepanebemim_tajefifikul.pdfIn PDF document text
    • https://sojimivur.weebly.com/uploads/1/3/4/8/134883767/rosogatol.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/jjhgjey/diluruzev.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/gajakelegeza/bigoxuviwewu.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/dell_inspiron_n5010_bluetooth_driver_windows_8_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/lasodisosezuruxinemikivav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6758950f-04e9-465e-b2e7-f35213d39c0e/does_shark_warranty_cover_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/jisamurelosasuravuko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a59ff36-2ebc-4904-a107-8e8da59a5ebe/film_genres_listening.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_off0000ff6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 5660 bytes
SHA-256: e03ff441d53178abdebdce9aab9d84f79d356485e812bfafe1817e6546723fb7
font_01_sfnt_off0001128f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128F 10864 bytes
SHA-256: 71303f77c15e38a6fa927190854bd6e2696898036685344f81a924997e052aa6

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