Malicious PDF — malware analysis report

Static analysis result for SHA-256 58fefafe6c76c526…

MALICIOUS

PDF

76.7 KB Created: 2021-03-16 08:03:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 558ea2c5748ce21f9e42bbd303f28400 SHA-1: b00dafa93bf543ab2fc5fffac7cc093a13af388a SHA-256: 58fefafe6c76c5268f01bafa7eeb000924d73d21050e94a65950007d35a4359a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely for SEO manipulation or to distribute malware. The presence of multiple external URLs, including those hosted on domains like kuzutuzo.ru and cdn.sqhk.co, further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=what+are+good+spanish+girl+names
    • https://cdn.sqhk.co/fopujetoros/wheVheb/best_mirrorless_camera_deals.pdf
    • https://cdn.sqhk.co/patagarinixa/bYY4fje/51666762419.pdf
    • https://cdn.sqhk.co/wefenosefob/XgjnMhh/video_editing_music_effects.pdf
    • https://cdn.sqhk.co/kovixileta/jihg0hd/cbse_class_9th_social_science_ncert_solutions.pdf
    • https://gejejemimegi.weebly.com/uploads/1/3/4/8/134899280/mimugigi.pdf
    • https://static.s123-cdn-static.com/uploads/4417033/normal_5fedcb90c5e33.pdf
    • http://redit.fun/how_fast_can_a_tesla_model_3_long_range_go2umcv.pdf
    • https://cdn-cms.f-static.net/uploads/4383565/normal_6020d411eb671.pdf
    • https://cdn.sqhk.co/buzovegom/OzTidHj/vawale.pdf
    • https://cdn.sqhk.co/nimuxugemu/cOheahj/56399602058.pdf
    • https://wudegilunukoga.weebly.com/uploads/1/3/1/3/131379548/noserelaxowabedu.pdf
    • https://cdn.sqhk.co/veladaxuzeba/JcLtgjL/vemadamipusufotop.pdf
    • http://maddot.space/certification_of_trust_formbn19s.pdf
    • https://dikarofojosej.weebly.com/uploads/1/3/3/9/133988548/kugadedoxebob.pdf
    • http://phulop.store/xavuziwisukawekavolu1ddzl.pdf
    • https://cdn.sqhk.co/dederubap/ija0jej/california_earthquake_survival_guide.pdf
    • https://sajosapisede.weebly.com/uploads/1/3/4/3/134344890/2cbb9b0f.pdf
    • https://cdn-cms.f-static.net/uploads/4369495/normal_603c57ce9c122.pdf
    • http://rostov-mobile-doctor.ru/wilotimo1keyw.pdf
    • https://cdn.sqhk.co/bidogefapo/Ngdhjid/nursery_rhymes_for_babies_to_sleep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6bb4b827-8582-4d6f-8937-42f8ab065f73/interview_questions_and_answers_for_hr_executive_position.pdf
    • https://uploads.strikinglycdn.com/files/ff4c4111-3619-4eb0-8fbc-c3e8b0e3a8a1/dsc_1832_trouble_code_5.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_off0000ec52.bin
0d0b2063feb8b6c4638196887538df5e7e316ba1036c7b0b94834b59e589c4e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 5384 bytes
font_01_sfnt_off0000fe86.bin
299b91123201c722d2a217d4c67843ab6b58227c63e50337021ee2b658a47837		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE86 12116 bytes

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