Malicious PDF — malware analysis report

Static analysis result for SHA-256 4761f0042422178f…

MALICIOUS

PDF

91.2 KB Created: 2021-01-21 23:25:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fa1609e4ade1f8898352332ac11aa34a SHA-1: 37cc48221afa02a4c21326e26c1ffab318edd843 SHA-256: 4761f0042422178f171a22f67d2a3c82f26dd8b0c9a9a6f0319505976273eb4a
244 Risk Score

Malware Insights

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

This PDF file contains a large number of links, many of which point to disposable hosting services and redirector infrastructure. The document body, though heavily obfuscated, contains references to 'Minecraft build generator' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure for users interested in such topics. The presence of multiple malicious redirector links and the ML classifier's high confidence score indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/123?utm_term=minecraft+build+generator In PDF document text
    • https://nevajuto.weebly.com/uploads/1/3/2/6/132695651/milejedofesa.pdfIn PDF document text
    • https://pugadaxalan.weebly.com/uploads/1/3/1/4/131437680/6601778.pdfIn PDF document text
    • https://daguvosiliwu.weebly.com/uploads/1/3/1/4/131406153/8741657.pdfIn PDF document text
    • https://luxabilep.weebly.com/uploads/1/3/0/8/130873941/tafaluzetojewu.pdfIn PDF document text
    • https://xopugexufejan.weebly.com/uploads/1/3/4/7/134709921/4597603.pdfIn PDF document text
    • http://jalukilesojed.22web.org/bootstrap_3_register_form_example.pdfIn PDF document text
    • https://tamipabofoj.weebly.com/uploads/1/3/4/8/134876193/wavuzam.pdfIn PDF document text
    • https://zinebogexorebo.weebly.com/uploads/1/3/1/4/131437984/xedunonijivuba-fifazopitosuxe-xasozesux.pdfIn PDF document text
    • https://gafapelisepofas.weebly.com/uploads/1/3/4/7/134762307/2633416.pdfIn PDF document text
    • https://site-1175702.mozfiles.com/files/1175702/murder_hornet_sting_coyote_youtube.pdfIn PDF document text
    • https://vugifalufaduzo.weebly.com/uploads/1/3/4/8/134889855/2219852.pdfIn PDF document text
    • https://site-1172565.mozfiles.com/files/1172565/45390280627.pdfIn PDF document text
    • https://nusemidokiz.weebly.com/uploads/1/3/5/3/135395372/f25bccf53.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gedamodeges.epizy.com/movies_free_in_tamil_dubbed.pdfIn PDF document text
    • http://sovotovagito.epizy.com/94432815796.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_off00012b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B82 5156 bytes
SHA-256: 3bcda7a7a4883f0a66591f75b58cd62133c11cb1e8d6e8e2a17fb30f20577867
font_01_sfnt_off00013d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D27 10392 bytes
SHA-256: f7e5732b11a3172a2a5334cd1884f81adcedaf4465363dd3217e70d4017599b7

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