Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f4c696b359efa0…

MALICIOUS

PDF

79.5 KB Created: 2021-03-11 00:20:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b69c0b28e1101f1e516130a74ea0152a SHA-1: 7beee14103c877a0b60fa262257b70b8a37ee3e4 SHA-256: 78f4c696b359efa03e8f72346fe756797a06cc1904058f0103a16c16d88ebdbb
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting a link farm or redirection scheme, and the document body is heavily obfuscated. The presence of embedded URLs and the overall structure point towards a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://druttle.ru/award?keyword=guia+ceneval+pdf+preparatoria+2020 PDF link annotation
    • https://cdn.sqhk.co/difanemifal/jejaEql/yu_gi_oh_duel_links_free_gems.pdfIn PDF document text
    • https://tujuveduveb.weebly.com/uploads/1/3/1/8/131871390/2187646.pdfIn PDF document text
    • http://busimaderule.mywebcommunity.org/4262474655.pdfIn PDF document text
    • https://wudegilunukoga.weebly.com/uploads/1/3/1/3/131379548/rodujizelidete-fadigovurava-notaluno.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/OCjblcm/71225250276.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/cidjaRH/rolling_stones_gimme_shelter_movie_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/hfRjfsJ/disney_princess_toddler_dress_up_trunk.pdfIn PDF document text
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/9051692.pdfIn PDF document text
    • https://xokaxopo.weebly.com/uploads/1/3/2/3/132302824/2515352.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/hidjaq7/93553109646.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/gadumagabusodel/australian_visitor_visa_form_1149.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/communication_plan_pmi_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/zedof.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/nifasixivabaxexeg.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/xamomidid.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/zezegoleg.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/john_deere_310_backhoe_for_sale_in_bc.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/ultrasound_guided_celiac_plexus_block.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/bonjour_print_services_for_mac.pdfIn PDF document text
    • http://gajutar.onlinewebshop.net/19116487366.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/maburowotumoxorixugi.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/43187286879.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/jaani_dushman_movie_bestwap.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/what_road_signs_are_on_the_illinois_driving_test.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_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 5336 bytes
SHA-256: f93510dbf224f0ca6573ad433aee650e136b90d206fa65790ebfc23ec519ce99
font_01_sfnt_off00010a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 11064 bytes
SHA-256: d33da7bb9b1d0d97249edbcca1fcad751bb5612f81ec836d79ea9b8e1d24ff80

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