Malicious PDF — malware analysis report

Static analysis result for SHA-256 1050e2ee929a8d6d…

MALICIOUS

PDF

67.1 KB Created: 2020-12-08 19:20:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 071916fc20d6795a4069de899baa768b SHA-1: d9955fda7b75e1c9475953c136b30f1efbf03c5c SHA-256: 1050e2ee929a8d6dd9eeea49f4a0398ed1d1973a85a2883553a8626cc159312f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/strik?utm_term=rwu+academic+calendar+2017+2018 PDF link annotation
    • https://rupuxiziwaxez.weebly.com/uploads/1/3/4/7/134765543/9101c03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450890/normal_5fa2bfcd9481d.pdfIn PDF document text
    • https://jowakalol.weebly.com/uploads/1/3/4/4/134480841/fujubisasesu_dofex_nibefigot_besem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377902/normal_5f954b749f52f.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/roxolaziginuz-zeramawuzeke-dojapig.pdfIn PDF document text
    • https://botomaluxezevip.weebly.com/uploads/1/3/4/3/134340767/ruvaza_veroxulifevo_xolafivibojiba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_5f8fdb0350c5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403672/normal_5fa6c666bf000.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/9bca2591-da1f-45d6-8aaa-96f5878ecee9/meaning_of_bottom_up_processing.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc78d8be9133927d90f7fcb/t/5fcb112611c29807e6d3073a/1607143718942/radio_shack_catalog_archive.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_off0000c564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC564 5608 bytes
SHA-256: a41254e5f6717d054143b2ee18579ee7439e0d207f04d2ed3387e5291e27a675
font_01_sfnt_off0000d87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87A 11180 bytes
SHA-256: a12bd1f1d45fa0a8e5980d23d69b907adbf073f0df87f4e5052c8fe61691deec