Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca803d0e9745fb33…

MALICIOUS

PDF

88.2 KB Created: 2021-03-08 08:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f21c1f718e9c62aaed35f69e48c2fd79 SHA-1: b1b07360aea26c5d32c62720760f2b6eae5649bc SHA-256: ca803d0e9745fb337a039451ff6b7a5089d6987ea14936ce28c38a7dc298ee87
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically identified as a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of a URL pointing to 'golowaki.ru' with a 'strik' path suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://golowaki.ru/strik?utm_term=macbeth+script+act+4+scene+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448545/normal_6015c335bb978.pdfIn PDF document text
    • http://exemplpusj.com/php_form_action_submit_button0lux7.pdfIn PDF document text
    • http://blancop.xyz/remington_11_87_20_ga_cantilever_slug_barrelnm0pu.pdfIn PDF document text
    • http://tortomsk.ru/12697140404y7ub7.pdfIn PDF document text
    • https://cdn.sqhk.co/bezorufuv/Bhigfgf/garden_design_blogs_australia.pdfIn PDF document text
    • https://gideturifit.weebly.com/uploads/1/3/4/8/134887905/5613862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380210/normal_603c2dabbbfeb.pdfIn PDF document text
    • http://itanto.space/12649066454k0p9e.pdfIn PDF document text
    • https://cdn.sqhk.co/pugipepa/eWjfS2P/minecraft_3ds_on_2ds_xl.pdfIn PDF document text
    • https://lexikusu.weebly.com/uploads/1/3/1/4/131438729/juripoxuzewanagidusi.pdfIn PDF document text
    • https://cdn.sqhk.co/fiduzosi/jeIghji/ccleaner_pro_free_for_windows_8.pdfIn PDF document text
    • http://golomashvanna.xyz/tenu_ishq_mera_le_duba_song_downloadrpl8j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_4f8f5c262eee4bdc82c1eb3bdb2d542b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84785121-f539-43e3-8ac9-b1cfe155b355/hp_deskjet_3050_printer_setup_download.pdfIn PDF document text
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_06b579fee51e40debb0907649b614561.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a4a38b-b83b-41e6-b647-4837e5d9e8cd/panasonic_th-42px60u_wall_mount_instructions.pdfIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_3c6c0c1969f14c2698655706e30d6108.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28ee296f-3bc3-44ea-b37e-d8b2041568a2/38709803435.pdfIn PDF document text
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_beaf067355f54a389a41a11904157a62.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad51bd03-9c52-4670-a832-df1dcb09aa8c/what_qualifications_do_i_need_to_be_a_book_illustrator.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_9ef339f219c845c7bc822a5cc13c4f98.pdf?index=trueIn 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_off00011d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 5272 bytes
SHA-256: 491d7844edd8b694d75cc8a507afa7273b46667d227511e869679b9a95526ed4
font_01_sfnt_off00012f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4C 10684 bytes
SHA-256: e8e8e6e6591ced18a9d82f16e19984c2a07656b5366945f5c9b4d3b985df72e1

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