Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c3c3b572dbb620…

MALICIOUS

PDF

82.5 KB Created: 2021-03-21 06:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a977a678d5a409e0fa7ec7eb46649379 SHA-1: 0956ee686b15b14bfcea800cac8ffa6c7fde6111 SHA-256: b9c3c3b572dbb620ff91b463c13f6f4879b762f8d145289696da566da3736a0d
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, many pointing to SEO-optimized PDF documents, suggesting a link farm or phishing operation. The embedded URLs, such as 'https://kuzutuzo.ru/wix?keyword=zombie+frontier+unlimited+money+and+gold+apk', are likely used to redirect users to malicious content or phishing sites. No scripts were extracted, but the PDF structure and numerous external links strongly suggest it's part of a phishing campaign.

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 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/wix?keyword=zombie+frontier+unlimited+money+and+gold+apk PDF link annotation
    • https://galanopudaxu.weebly.com/uploads/1/3/4/1/134109153/rebasefakapiw-mojeruped-jagag.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/is_wendys_spicy_chicken_salad_healthy.pdfIn PDF document text
    • https://vebexedupatad.weebly.com/uploads/1/3/2/7/132740253/noxebu.pdfIn PDF document text
    • https://moxeduve.weebly.com/uploads/1/3/0/8/130814104/tedidemuwutofud-jopov-kutabekeb.pdfIn PDF document text
    • http://saduzemed.mypressonline.com/ny_dmv_knowledge_test_class_d_answers.pdfIn PDF document text
    • https://miniroworopan.weebly.com/uploads/1/3/4/4/134444940/zitukenugero.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/tp-link_tl-wa850re_access_point_setup.pdfIn PDF document text
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/goraxokimer.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/kubafezin/how_is_dual_federalism_different_from_cooperative_federalism.pdfIn PDF document text
    • http://bexukavibume.myartsonline.com/petsafe_yardmax_transmitter.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/ratirolovuwagaxevufigoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/puwunexiniw.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/how_to_program_chamberlain_clicker_with_liftmaster.pdfIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_5addfc59d33a4d298308da99681c071e.pdf?index=trueIn PDF document text
    • http://ladurabazidema.onlinewebshop.net/what_degree_to_get_for_interior_design.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/dictionary_english_spanish_cambridge.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/78292971488.pdfIn PDF document text
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_3cbcc352868a4ebb813401a167bc960a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zedudo/mokadowavupidogopozusuwas.pdfIn PDF document text
    • http://furafep.onlinewebshop.net/strategic_management_course.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_off000102b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B0 5444 bytes
SHA-256: 5296ac1167fcbb1df9992cfd86e6f3363afcc79a77f25143fe9f2bacde3a4352
font_01_sfnt_off00011532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11532 11624 bytes
SHA-256: 08ed175c1e83d86082d95cb9087bf3c6cef10e046125342fd39b70e79b6cf7c4

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