Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b0555a15d61116…

MALICIOUS

PDF

88.1 KB Created: 2021-06-09 19:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6762a17e5d9e1c7484bd3c7898343621 SHA-1: c637394929a993418f216208abebd3e33e7d9695 SHA-256: 06b0555a15d611164a02bdd10206028935adb9958d130250115a210d6d03e857
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains heuristics indicating it is a link farm and a social engineering lure to install a browser extension or update. It also contains an embedded URL pointing to a suspicious domain, likely serving as a download or redirection point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://botokaw.ru/123?utm_term=autocad+free++for+pc+64+bit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413848/normal_600ddc5894df9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417537/normal_6061f16e109b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379974/normal_5ff508dc3a769.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/04c52a83-079a-4ecd-aaf8-abfdabcbbb5c/79691306623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c804c713-a129-4c51-aaae-4530246b9a0f/is_g_shock_a_good_brand.pdfIn PDF document text
    • http://gazoridixilu.pbworks.com/f/xidezumuzunuxedixalat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54f80a4b-11b1-4518-b35f-7ccc6bd8b0eb/phantom_of_the_opera_broadway_plot_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a8735f-7b38-488f-bf4f-c701b46286b2/37994983009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6160a05e-921c-4113-b876-3f92557f640b/java_para_minecraft_32_bit_download.pdfIn PDF document text
    • http://jebusolole.pbworks.com/w/file/fetch/144643425/house_cleaning_checklist_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88bb5e18-c56b-4db7-8fc7-7fd9d3aab324/whirlpool_top_load_washer_cycle_times.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3af7df97-ee58-458c-9721-258561427c84/identifying_laboratory_equipment_worksheet_answer_key.pdfIn PDF document text
    • http://denipugo.pbworks.com/f/ultimate_portion_fix_plan_a.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/w/file/fetch/144562974/sidapegi.pdfIn PDF document text
    • http://pibadaro.pbworks.com/w/file/fetch/144580803/fawibijidipuwosadi.pdfIn PDF document text
    • http://sisagexal.pbworks.com/f/jevanorerubomojosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4e1bc3-d858-4b82-a68e-322b75a6dc77/jikibosuwevuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b17485c-7d5a-4742-80b8-77fd61f3f052/75401637053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24b7c40c-e2b5-4759-94bf-2c6cc341badb/how_to_start_lifting_weights_again.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 5308 bytes
SHA-256: e12fe7c92034cfcd9803e1e665bb1182136bc97fe7f1374482438f8e7d63d14a
font_01_sfnt_off00011375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11375 12212 bytes
SHA-256: 82e44b10eab6e0a4538da4bd92ccccb70b1d29c29d6b66fd2f242a84336c87d6
font_02_sfnt_off00013ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCF 16460 bytes
SHA-256: 7eb78095b18ec71d092dba10ac3deb390da48e6aafb8d9225dbf8545f08c637f