Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a9305f7ed97bfa…

MALICIOUS

PDF

79.1 KB Created: 2021-03-28 10:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c4e590853a2496e2d048e41d3939db3a SHA-1: 47a8aee3a2e3dcd08418e3cefcf014c3642d783c SHA-256: c3a9305f7ed97bfa6caa63b76cf2407d90508fe8a339ff880a0a491dad164bed
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The presence of a large number of external links, many pointing to PDF files, suggests a link farm or a mechanism for distributing further malicious content. The primary malicious URL identified is https://kuzutuzo.ru/strik, which is likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=tutorial+adobe+after+effects+cs3+bahasa+indonesia+pdf PDF link annotation
    • https://cdn.sqhk.co/kovixileta/8gifgjx/kakeburoxenuxaxikep.pdfIn PDF document text
    • https://cdn.sqhk.co/vunalogivefu/jchehey/petab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://31e64076-56b3-4e53-9780-179364fbad2f.filesusr.com/ugd/d8d3cb_4b2439708fac45c1a3da2c256442aeb4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lonozote/lewumuke.pdfIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_5dcd5c11e09842ad891a6316a0debd32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/dubutase.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/gevupebedazo.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/betternet_premium_apk_mod_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/4069405554.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/mergers_and_acquisitions_ebook.pdfIn PDF document text
    • http://ruzizasasasami.rf.gd/prey_how_to_remove_mind_control.pdfIn PDF document text
    • http://noporotosodapo.epizy.com/how_to_fix_brother_printer_ink_absorber_full.pdfIn PDF document text
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_432a5f6dc9c14ecf8b4cfa2eac3456fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/bitufixogotogarevamen.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_6e1f2f460ba74df18ee5069da50a1cb2.pdf?index=trueIn PDF document text
    • http://petegamab.epizy.com/sadajiluguniweriruxibuj.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/romeo_juliet_telugu_movie_songs_download.pdfIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_d7b9af3aa5cd463d919c63167cb08570.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dukajevo/color_meaning_chart.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_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 5496 bytes
SHA-256: 0d59cf1426051b6dc2867730f2adcb4bf4e07dbcceeaecc7e4bb3cb3ca8f9fe9
font_01_sfnt_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 20828 bytes
SHA-256: ae87924e38fcf55aecee91677f3cbeb5c128bf236f0a31dd2e9c6883361a717f

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