Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d41fb0bcd06c35b…

MALICIOUS

PDF

68.6 KB Created: 2021-03-29 19:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d1879fb9f97afda0f908bdfbdb41687c SHA-1: 228bccf24f972da4823d2fc11a9585166359fc54 SHA-256: 5d41fb0bcd06c35b39acc1523be70535e4c317f4f5566533a891b6a356a7cff9
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URIs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to contain metadata related to 'Metro 2033 ending achievements' and the wkhtmltopdf tool, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=metro+2033+ending+achievements PDF link annotation
    • https://gawofatofuwe.weebly.com/uploads/1/3/1/3/131380275/882899.pdfIn PDF document text
    • https://gosabejeda.weebly.com/uploads/1/3/1/4/131453015/fajur.pdfIn PDF document text
    • https://wogifirum.weebly.com/uploads/1/3/1/0/131070377/1e7b84d.pdfIn PDF document text
    • http://siwupezomejen.getenjoyment.net/64251347071.pdfIn PDF document text
    • http://kikawogax.iblogger.org/50126485319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465263/normal_6039f421347f4.pdfIn PDF document text
    • http://xasumemazekejo.scienceontheweb.net/jisinuxibejebatibure.pdfIn PDF document text
    • http://gididowofugu.iblogger.org/apollo_twin_duo_mkii_usb.pdfIn PDF document text
    • https://gebonevoduxap.weebly.com/uploads/1/3/1/6/131606392/gixor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_6016c3abd6df9.pdfIn PDF document text
    • http://didazema.mypressonline.com/66910196780.pdfIn PDF document text
    • https://kogojovuxerew.weebly.com/uploads/1/3/4/8/134882843/lewezavixavo_towujufutenir_bigobebeguzudip_mesafa.pdfIn PDF document text
    • http://remipav.22web.org/solr_search_engine_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402706/normal_600a1d9b55a3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390637/normal_605f51ff7c0d4.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
    • http://zobawukesilebaf.epizy.com/wofive.pdfIn PDF document text
    • http://bigoxusu.rf.gd/73219253211.pdfIn PDF document text
    • http://mimugoso.rf.gd/99696540291.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_off0000c0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D0 5612 bytes
SHA-256: 2eca1e7e8ed6bdc3cf6ebcbe3bbd04c35c11d4b501f81ea08da0767b9a7b65ff
font_01_sfnt_off0000d3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B7 10336 bytes
SHA-256: 67ce6d0a0d58caca12e24109a9fc2656db66fb013e9b8d0082a40c44d1962465
font_02_sfnt_off0000f731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF731 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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