Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1e6bfb309f7b2e…

MALICIOUS

PDF

74.1 KB Created: 2021-04-25 08:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bc104f0766d8fbf952a8e1ac753a7ecd SHA-1: 7345b50de11110347da7b43de63ee15ba72807fd SHA-256: bc1e6bfb309f7b2e7127607dae7085bced8c8ef7423c56f3bbbf41f16ccfdc25
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and the document body suggests it is a worksheet, likely a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable domains, suggesting an attempt to obscure the true malicious destination or distribute malware. No scripts were extracted, but the presence of external URIs and the phishing classification strongly suggest a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://baarspo.ru/strik?utm_term=possessive+pronouns+worksheet+for+class+3 PDF link annotation
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/438163.pdfIn PDF document text
    • https://cdn.sqhk.co/zurajekiviw/hFjbfZq/meetme_user_search.pdfIn PDF document text
    • https://nanavefog.weebly.com/uploads/1/3/0/7/130775134/9294714.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxofalu/qjb7vid/mugalisavusuzazunubub.pdfIn PDF document text
    • http://wazinufezil.iblogger.org/77872031107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_602fd58d0af8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407747/normal_5ff7c080bec87.pdfIn PDF document text
    • https://zelekunidos.weebly.com/uploads/1/3/2/6/132682808/8363807.pdfIn PDF document text
    • https://cdn.sqhk.co/sugutomipu/gdgcjeM/31287588013.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wutivufugisev.epizy.com/gat_analogies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/084b9398-4ac4-476c-9ff5-a21675cd9082/nefufubesige.pdfIn PDF document text
    • http://wufizomofoduzin.rf.gd/rifewitem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7188666-6afc-4463-8c45-ada344fdd205/dodge_durango_shifting_problems.pdfIn PDF document text
    • http://zidufixeda.epizy.com/canmore_rcmp_report.pdfIn PDF document text
    • http://mejufupivu.epizy.com/function_of_cassytha_filiformis.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_off0000e175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 5484 bytes
SHA-256: d9c0de5880ba6a3fe6e2e590291e2b10a6d0afcffe406e00e2636a068bd3c1b6
font_01_sfnt_off0000f437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF437 11024 bytes
SHA-256: 6735430f6ec8cc742469bc3aff9137d5a6647a9e065e24371da002e36b1f0d6b

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