Malicious PDF — malware analysis report

Static analysis result for SHA-256 f770b7448b50dc88…

MALICIOUS

PDF

73.9 KB Created: 2021-04-02 14:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c903c6384cf3d5f6fc70e8c56649297f SHA-1: bac728b76739ddfb73541c31faa79e9b052e3c59 SHA-256: f770b7448b50dc88502fc3d476e7da971d9fc021dbb8dafa3a7b5147588a9e81
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to what appears to be a link farm designed to mimic search results. The primary malicious URL identified is golowaki.ru, which is likely used to redirect users to malicious content or phishing sites. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://golowaki.ru/award?keyword=jurnal+bagian+bagian+bunga+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407996/normal_5fc87547684d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379744/normal_60286987d397f.pdfIn PDF document text
    • https://boxemafal.weebly.com/uploads/1/3/3/9/133997404/deduvuka_rofux.pdfIn PDF document text
    • https://boziwukajolefix.weebly.com/uploads/1/3/2/7/132711983/3140281.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469630/normal_5fedd662c610e.pdfIn PDF document text
    • https://sefidobove.weebly.com/uploads/1/3/4/3/134320077/pixozen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404757/normal_5ff63a9e960be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413108/normal_604e7375ebd18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464707/normal_5ffa257f3fa68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447903/normal_602405751b493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383464/normal_5fda0fda82f51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423430/normal_5ff25115426a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_604e5ac13da48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422640/normal_605b9bbb596d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381095/normal_6043ef3d3666d.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/9a522e7a-b27e-4826-817a-4246a04020b4/43528227157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c624a6b1-04ab-4837-b179-02e741576b1d/ratakitowikiwonajejevam.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/fadawuwejojozugogoremefam.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/likekixanevisafomazulem.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/62935378146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a29eac22-5e9b-4000-8c6d-9d5a3d75d052/sword_art_online_games_release_dates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17b0c330-11da-48f7-b781-68ee1f618c80/hp_envy_4500_all_in_one_printer_software_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/lumufajeje.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_off0000e605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE605 5160 bytes
SHA-256: 2ab3d8dd967e127fa3a5e02f6bf7a5a675e9ebde281763a88162efec650ded9a
font_01_sfnt_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 10100 bytes
SHA-256: 6249a1c9c79c60475e20ac5c23d4e9793302df3e56d43637c99e33e12d8d3a24

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