Malicious PDF — malware analysis report

Static analysis result for SHA-256 056f216f43e9b97a…

MALICIOUS

PDF

80.6 KB Created: 2021-04-03 16:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8c77953e46d5ce94423d9b98aa468330 SHA-1: 0329db333010c0a8bdedd5cbf624740b0d74d305 SHA-256: 056f216f43e9b97a0d8a164cd0a9aedd7dc261300385a457c74f60dbbe25d29e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and link farms, indicative of phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns align with common techniques for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=livro+avivamento+pdf PDF link annotation
    • https://cdn.sqhk.co/fazituku/ac5fijc/58143046768.pdfIn PDF document text
    • http://vukuradi.mygamesonline.org/textbook_of_biochemistry_for_dental_students.pdfIn PDF document text
    • http://mnclassis.org/voromupemorcaumf.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/data_structures_in_cpp_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/YgcAhhT/38897198377.pdfIn PDF document text
    • http://mybestchan.online/dodaxetisitotozcet0a.pdfIn PDF document text
    • https://cdn.sqhk.co/fanasuzajem/mgiYfXj/jafowuwubilisaxu.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/bsc_zoology_syllabus.pdfIn PDF document text
    • https://cdn.sqhk.co/rotazokufaj/ioWm5ii/chikki_recipe_sesame.pdfIn PDF document text
    • http://rumigiwataj.getenjoyment.net/spironolactone_davis_drug_guide.pdfIn PDF document text
    • http://idealica-ordina.site/anuraga_karikkin_vellam_full_movieu1eeu.pdfIn PDF document text
    • http://oneitshop.info/wuxanawetetiwwpivx.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/JgiYqgc/rifapinoxuvufigebesavo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tulajadulixo.myartsonline.com/ragarasozapewanemato.pdfIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_1c5ad3e6a2914355bbfea2c6496440ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9a488e8-e222-4980-99c7-4a0ad0aed309/73711777799.pdfIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_9c232b7f13f846feb62d9ee89bc43f3a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83c9b236-92d5-4ac7-83ae-bf85fadddffb/redafedemumugajetibirebej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/952ffbac-d9b0-490a-bd49-993a32dcf989/feregavalizizaz.pdfIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_c3fb35eeebc74569bab3fc9123a1370b.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_off0000fb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7F 4976 bytes
SHA-256: 2e46d98257e72969c82d9b6a5fb6bc115cb141e87f7171e21c7e80a0606c8c8e
font_01_sfnt_off00010c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C62 12944 bytes
SHA-256: edbb06a3c63067b71bfe2f8611e118ff2362ae24aa393818cb8e2db65861354c

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