Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d37e71681ae227…

MALICIOUS

PDF

77.3 KB Created: 2021-03-25 10:19:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88c45de5efc67f0224c9f572776a8e07 SHA-1: d63131d412515d815f97209e8763ababa2adde5c SHA-256: c4d37e71681ae227d0953a456a67334421df2b5fb34176593fbc7b805717fd60
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://midufefew.ru/aws. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/aws?utm_term=small+log+table+lamp
    • http://mebel-albero.ru/how_to_make_oil_with_sunfloweroq21u.pdf
    • http://helen-art.ru/que_es_la_introduccin_en_un_trabajo_escrito_ejemplotlsrg.pdf
    • https://fakodide.weebly.com/uploads/1/3/0/8/130874451/8246409e135a7ba.pdf
    • https://tedotedonux.weebly.com/uploads/1/3/0/7/130775879/faxute.pdf
    • http://livecopyrightverification.com/51202464191z6l54.pdf
    • http://remastacer.com/37478617719zgu3i.pdf
    • http://hempmap.ru/netumokenubidoxawfoh.pdf
    • https://fukopimuwevi.weebly.com/uploads/1/3/5/3/135351499/535390aeeb25.pdf
    • https://xososikanezav.weebly.com/uploads/1/3/4/8/134892973/3566f3dd34b4.pdf
    • http://lalat.space/tomumobiz4fuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://73b3f487-90f5-41a6-bf44-750372f72efd.filesusr.com/ugd/39e8d0_1385ba71b21744cb82b2d96ecd5b8513.pdf?index=true
    • http://wokeben.epizy.com/43684792038.pdf
    • http://podixevobelataw.rf.gd/samsung_32_smart_tv_price_in_kenya.pdf
    • http://fokidewuvawop.epizy.com/63512285421.pdf
    • https://s3.amazonaws.com/fizaxo/tafasinofafobakanodimo.pdf
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_678406364ae540b48e49f6bb50591cfb.pdf?index=true
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_1ae32d35b9a64a12b66e3104fb546f4e.pdf?index=true
    • https://s3.amazonaws.com/xapijifas/descargar_drastic_3ds_emulator_android.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e4.bin
5f5ed961abb18b764f6f3d925069f5201de48d226f59b78289bd1ac8116ffda9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 5108 bytes
font_01_sfnt_off00010534.bin
14592cd5f884cd3a5159cb4df3211c14042966af6b3d9240c6bc38e13ce2d965		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10534 10308 bytes

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