Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b09b0088c0d08f…

MALICIOUS

PDF

81.6 KB Created: 2021-05-28 11:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 97f46f8e686791c2fe611b9515039c87 SHA-1: ee77b18055832cfbc13d70296487aeb5faa86e31 SHA-256: c3b09b0088c0d08f877db918749c5c0b7e4e4d05076cba35a063d525951a9edf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM and PDF_URI heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially garbled, contains text related to performance evaluation and mentions wkhtmltopdf, suggesting it's a lure to a site like zajinet.ru for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=evaluaci%25C3%25B3n+y+calificaci%25C3%25B3n+del+desempe%25C3%25B1o PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446038/normal_600b9388d95ca.pdfIn PDF document text
    • https://nexawukuvinu.weebly.com/uploads/1/3/4/5/134578226/3643150.pdfIn PDF document text
    • https://konatewed.weebly.com/uploads/1/3/4/6/134692195/gavese_bilimu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481841/normal_5ff0e474f2aea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500201/normal_600c0b4f44736.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410703/normal_5ff3a191ce4e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490529/normal_6025e4096ad51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_6023cdc174a7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413455/normal_5fcc62f84e31c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419650/normal_6024a4044c556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_600b18911eac7.pdfIn PDF document text
    • https://luruxelu.weebly.com/uploads/1/3/2/6/132682974/nuzibujisuger-jufezaxuvi-siberomijim-nulorevas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_606566a515fa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501501/normal_60200ac143bfe.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://uploads.strikinglycdn.com/files/c6249b0e-cc36-4463-858e-6b8c3ab55d6d/vaguselefusawasugix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b46a00c-2551-4252-9d63-57e79e0c47f7/cuanto_cuesta_el_rublo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3639065b-16f1-4067-8743-cdc89eb07245/95702040174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36b31872-5d14-4380-b924-226cfe327724/bebazafoxibutezegupuvetam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2f6c764-f7d5-4331-8983-974a4bdf3e0d/17259866869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef20a837-2099-4326-9274-6d575a9eac9b/zebra_zp_505_install_driver.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_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 5476 bytes
SHA-256: 55e485791c30a48606551cdfae1389b191f1162f5d17d9a42ac363bd019d10e9
font_01_sfnt_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 11880 bytes
SHA-256: d105c12963dc727f68aec97f789351b2f0db27a13dad853cc03c16c8ea44aaf3
font_02_sfnt_off000128fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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