Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec37b0b2853832b…

MALICIOUS

PDF

81.5 KB Created: 2021-03-06 06:15:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 784bc6acc90d4834dc9725d4fcaad3f3 SHA-1: 95a6b5f8b7cc361e6b9945c31b906d265eac3e5e SHA-256: bec37b0b2853832bef1e2e574c19c171397ec1e3e915e698bca1273e01345431
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'kuzutuzo.ru' which is likely part of a phishing or malware distribution scheme. The document body, though partially obfuscated, contains text related to unit conversion and references the wkhtmltopdf tool, suggesting it's a lure to encourage clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 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://kuzutuzo.ru/award?keyword=formula+de+convertir+de+pulgadas+a+milimetros PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417414/normal_60250451bfd6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421780/normal_60240d8c7557c.pdfIn PDF document text
    • http://boomerangoo.site/xulunekurenobijebewezncjzg.pdfIn PDF document text
    • http://delaem-sami.online/splashway_cabana_mapzb92q.pdfIn PDF document text
    • https://cdn.sqhk.co/xodokopav/ijgSjcQ/lucky_triple_diamonds_car_dealership.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/dicgfty/jebobujogi.pdfIn PDF document text
    • http://zoraniguza.22web.org/29113715691.pdfIn PDF document text
    • http://moshon.space/best_textbook_for_analytic_number_theorygks3d.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/bqvicHz/57075637252.pdfIn PDF document text
    • http://topcreditmonitoring.info/titanic_theme_song_flute_sheet_musiczltsl.pdfIn PDF document text
    • http://nugiperemepan.22web.org/does_chrome_have_flash_player.pdfIn PDF document text
    • http://pifumufupes.iblogger.org/filling_pieces_shoe_size_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387428/normal_5fdeab73a1a1b.pdfIn PDF document text
    • https://bubijusafas.weebly.com/uploads/1/3/5/9/135994311/gadivuvogixat_pezuruke_mefolakusinun_bulejekufowamo.pdfIn PDF document text
    • https://nozudepoget.weebly.com/uploads/1/3/1/1/131163917/ruzibizetibi_fidolodatuxum.pdfIn PDF document text
    • http://capridigi.com/rsum_du_petit_chaperon_rouge2obd3.pdfIn PDF document text
    • https://cdn.sqhk.co/pekebugus/jaozghy/odia_bharat_lila_hd_video.pdfIn PDF document text
    • http://hempmap.ru/10134833973d5ayo.pdfIn PDF document text
    • http://domavera.ru/7238808677563r2c.pdfIn PDF document text
    • https://watowerapomos.weebly.com/uploads/1/3/0/7/130775357/sodipipi.pdfIn PDF document text
    • http://trenketo.buzz/ludaxubojeba9k7zi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387410/normal_6027e5d99123c.pdfIn PDF document text
    • http://tovelksa.website/choo_choo_train_sound_freea7vfk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390051/normal_5fd3afcaa30d1.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/zexolepov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://titegerekarirov.rf.gd/ammonium_nitrate_msds_sheet.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_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 5408 bytes
SHA-256: a8fa482da63c43dc49f44f3a2363b694f1a0de5574f51b17475055e29b6c82e8
font_01_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 15852 bytes
SHA-256: 6d420f6b3174638e8b901f16714af423808f4d1b8f2b219cb3224e05add90785

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