Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafabf59f71a0fbc…

MALICIOUS

PDF

74.9 KB Created: 2021-06-01 22:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c58255c8f696b2635822ffbb1dd4546b SHA-1: 02dbd19f6e6533def4995b5e72521de8566c6ed9 SHA-256: eafabf59f71a0fbc8cbac1ee7480a211c5170053b3e90c7332db729fe2e240e5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a large number of external links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV also identified it as malicious. While no scripts were extracted, the presence of numerous embedded URLs, including one pointing to mezovuduw.ru, indicates the document's primary function is to redirect users to potentially harmful external sites.

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 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://mezovuduw.ru/123?utm_term=fluvial+depositional+processes+and+landforms PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4443608/normal_5fcb4ab51bf5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486053/normal_5fdc4f808d4ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460954/normal_6040b2bb724a5.pdfIn PDF document text
    • https://pefiritiz.weebly.com/uploads/1/3/1/4/131453982/179663.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402507/normal_5fd049daeb25d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471682/normal_60146d62860cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385863/normal_606a2b150028f.pdfIn PDF document text
    • https://tenojamerefu.weebly.com/uploads/1/3/1/8/131857247/4697807.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388046/normal_5fcf69ef31378.pdfIn PDF document text
    • https://jilefufut.weebly.com/uploads/1/3/4/1/134109271/1134881.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385848/normal_6009a1547d7b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458417/normal_60331f7d2745e.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/b44d16e9-990d-42fb-a474-03ccbe8c4b88/jinilukunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f18b83f-5856-4010-bed1-0df39d37b2f6/how_to_connect_jbl_speakers_to_laptop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c95c2576-5828-4718-b870-3761f141e842/zukudifagevaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/645a8cb9-5732-4cb0-94ba-15bd77b543f5/the_pricing_of_options_and_corporate_liabilities_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cdaf8ab-a605-4dd5-82cc-0a77465aeb90/tuwenomimumigixolibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eff92ad-b3e1-4897-80b4-ab5498d9b3a6/nf_s_61-932.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_off0000e894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE894 5316 bytes
SHA-256: d07913e001a292bcfa06d4ad6d883f2404ffb8c9c53bc45e88cd27cf07917d67
font_01_sfnt_off0000faa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 10332 bytes
SHA-256: 22ff8224871a106d7da6ad9e5bbd1ed84f63a5fdcde738623d539db01ad42496

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