Malicious PDF — malware analysis report

Static analysis result for SHA-256 193a683ac34c0bdb…

MALICIOUS

PDF

67.2 KB Created: 2021-02-14 23:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 73f186a557995192dea58f91ba429836 SHA-1: 275e44bc12a9168f1fce08367c553e2fd6738c7e SHA-256: 193a683ac34c0bdb7bc96b25634973eedca5e144b39fefc2f5d633bd101a8028
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with a notable one pointing to 'seumenha.ru', suggesting a phishing or malware distribution lure. The presence of external URIs and link farm characteristics points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=minecraft+witchery+how+to+summon+baba+yaga PDF link annotation
    • http://mkr-olimp.info/amulya_jeevan_823oqsgk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416302/normal_600b0eaf3d9e8.pdfIn PDF document text
    • https://sedovabopidixo.weebly.com/uploads/1/3/0/8/130813108/04c37db424cbfd4.pdfIn PDF document text
    • https://piwetidij.weebly.com/uploads/1/3/2/3/132303123/9046033.pdfIn PDF document text
    • http://madamzero.com/cover_letter_sample_template_wordblsiq.pdfIn PDF document text
    • http://tipografiyav.moscow/day_by_day_hymn6mbwm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420587/normal_5fdef39a4360a.pdfIn PDF document text
    • https://malabukepi.weebly.com/uploads/1/3/0/9/130969546/dac34d27.pdfIn PDF document text
    • http://7lessons.site/79557750698p9shz.pdfIn PDF document text
    • https://fozabezadako.weebly.com/uploads/1/3/4/6/134639332/acc5bd7bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pazovugal/45657783267.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/25251233941.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_off0000caed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAED 5600 bytes
SHA-256: b8d15b16d77b0214f764309e660bddd914b3c53f44dcba88bef8aaf4189f1883
font_01_sfnt_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 9936 bytes
SHA-256: 3d1f731f5e914fe1607836885605afcac36f08a567af3d8c89f6abfa64b61983

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