Malicious PDF — malware analysis report

Static analysis result for SHA-256 c515a1db2dfc72a8…

MALICIOUS

PDF

104.9 KB Created: 2021-04-25 14:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 84cf58eddf9c530df1659990e365305f SHA-1: 09a18e56edbce93ddd9a835df35e009412f3cdd6 SHA-256: c515a1db2dfc72a8963cad01bb2b33464cb4a2e0298506bd326eb7493c038e76
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 associated with a search term lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=the+crystal+bible+pdf+free PDF link annotation
    • http://tramlaweq.online/foperutokonafugodovemeg0unjy.pdfIn PDF document text
    • http://insuranceautousa.com/nice_guidelines_copd_prophylactic_antibiotics6egr0.pdfIn PDF document text
    • https://cdn.sqhk.co/koxixoneto/9jgyGha/traffic_rider_mod_apk_unlimited_money_apk_home.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/kijij7z/lamod.pdfIn PDF document text
    • http://www19216801.site/35339989492p7m7c.pdfIn PDF document text
    • https://cdn.sqhk.co/vujixete/jaghujj/summoner_idle_td_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/sidigodoga/ggijgjf/lenovo_smart_clock_walmart.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/sirilagewuga/does_my_vizio_have_screen_mirroring.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_e23ef3ee4b2e42caa84adfd2b59d92aa.pdf?index=trueIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_148d0a1eb00545bb8192b5270587a5ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/janixenukufilopipabamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d1199c4-db21-4445-817a-2c4f76c23610/vomigejolejurizere.pdfIn PDF document text
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_ce8fdb04c218453fb32955b87a2ad950.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61e117ae-e35a-40d4-8ddb-a815803e194c/segejetexiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c743587c-98dc-4f89-af0b-6e72cecc684f/fifty_shades_darker_unrated_edition.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_5ef6ca5ab7764b5894828219da8d71ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rirusozo/galvanized_sheet_size.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/avon_m50_cbrn_gas_mask_for_sale.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_off00014736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14736 5432 bytes
SHA-256: 1f0086476cfd5841a7e487d311158758e7e9954b5cc47cc366509f9756b24ba7
font_01_sfnt_off000159ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159AC 11520 bytes
SHA-256: 277950dfc8fe309d309820528adfe352516aafe7be83242fef41416d9f7373b0
font_02_sfnt_off0001813b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1813B 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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