Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b7ebe635f33fdc…

MALICIOUS

PDF

80.0 KB Created: 2021-03-31 07:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 41d29b127aede830eb0b1dd6cdcebcbc SHA-1: cf0516164f368a77a8b9a6a3a79f2e85454f6f11 SHA-256: c0b7ebe635f33fdc547cfbea9b38422277ac21d9253d9cdc68fae6ee9c967ab6
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on 'https://golowaki.ru/award?keyword=beer+brewery+process+pdf', suggesting a phishing or redirection attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for such lures. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving a phishing or credential harvesting scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/award?keyword=beer+brewery+process+pdf PDF link annotation
    • http://rentline.pro/3560835705ys024.pdfIn PDF document text
    • http://construt.site/4520673580b8vhe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482636/normal_600c61c76957f.pdfIn PDF document text
    • http://migunovaj.iblogger.org/sikabojujatituk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368979/normal_5fcd27b7689c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369336/normal_6038ebfa0e5f3.pdfIn PDF document text
    • http://kind-insta.site/ejemplos_de_reacciones_quimicas_de_combustion_formulawyn8o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420018/normal_6000f650191b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416659/normal_600240fb0ba64.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/resumen_de_mi_planta_de_naranja_lima_parte_2_capitulo_1lwi67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_099dec2578aa42b4baed3dde079f847a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/risisipajole/lenovo_thinkpad_t430_wifi_drivers_for_windows_7_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/85634501309.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_48d411e1558b4a0b852e99f5c048262b.pdf?index=trueIn PDF document text
    • http://zedakukabizo.epizy.com/annual_report_nestle_malaysia_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daae0c60-e383-428e-bec6-134877d1881f/crisis_communication_plan.pdfIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_20601129c820486bae455f015e41a062.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ee360a-a6ed-456d-bd57-980a7f463591/37170111868.pdfIn PDF document text
    • https://dfabac9c-3a78-4d86-b112-ccf1750024e9.filesusr.com/ugd/b46e2f_a2ba829768844100b0847d92e93e0abe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa9a7a6-e003-4832-bbd5-de49786fbac8/whirlpool_gold_microwave_oven_combo_troubleshooting.pdfIn PDF document text
    • http://jipuzekas.rf.gd/gmail_drive_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/864a377a-16c0-4355-8d47-6068fb2fce8b/67786651845.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 4844 bytes
SHA-256: 5056d05331e307c39a574245b5ff269b43071deb4ba1c10cd41b36b1dc20f468
font_01_sfnt_off00010078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10078 10768 bytes
SHA-256: 4af14b9632da23667059ec7df56f8b32bc578f425e71388d53c0addb28c1347d
font_02_sfnt_off0001248a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176