Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b64803de21b109e…

MALICIOUS

PDF

91.6 KB Created: 2021-04-15 07:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2defd9e409d5ac1081cc47a0d236f42 SHA-1: 926df101a57eb7549812b86933fbe22e5f998fff SHA-256: 8b64803de21b109ebf07784f329e5ac08a6565d6cfdc055d8dfe1b99bb508db3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'mezovuduw.ru/strik'. This URL, combined with the document's content suggesting a movie search, indicates a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mezovuduw.ru/strik?utm_term=the+chaser+2008+full+movie+online
    • http://dobujebenebif.66ghz.com/channels_app_ios.pdf
    • http://raffle.website/dobumaxavm62f5.pdf
    • http://larts.digital/wesasupetasejasoxu174v9.pdf
    • http://alphabitx.com/watuvewesevivoginu4716u.pdf
    • http://scarcebook.com/bafuxosev1mo0n.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4d2bfd1e-7e5c-417c-a8d9-95970bf6f57f/h2o_mop_x5_target.pdf
    • https://s3.amazonaws.com/najubu/bursted_wood_primary_school_ofsted_report.pdf
    • https://s3.amazonaws.com/buponuwebi/birthday_card_templates_online.pdf
    • https://uploads.strikinglycdn.com/files/fa7e3106-35a9-4213-b26f-bc14b8737aa3/how_to_cancel_wsj_subscription_online_2019.pdf
    • https://s3.amazonaws.com/tutapaxi/irulu_expro_x1_plus_firmware_download.pdf
    • https://uploads.strikinglycdn.com/files/ee0fa70c-379b-41ea-9495-906406bcd16a/the_book_thief_book_download.pdf
    • https://s3.amazonaws.com/simujix/flygt_guide_rail_bracket.pdf
    • https://s3.amazonaws.com/mejigavukolu/mutirajosupugumerewa.pdf
    • https://s3.amazonaws.com/jixeremipet/85124800731.pdf
    • https://uploads.strikinglycdn.com/files/76f20f3a-2af2-4619-8a65-a18dd77e3d1b/93690171196.pdf
    • https://s3.amazonaws.com/wewuxuviwar/73625576616.pdf
    • http://merojupamen.epizy.com/manual_lavadora_brastemp_ative_11kg_inox.pdf
    • https://s3.amazonaws.com/kakekojezutok/fraser_island_4wd_guided_tour.pdf
    • https://s3.amazonaws.com/fenatagazise/1067668021.pdf
    • https://uploads.strikinglycdn.com/files/26453ac3-ada7-4aa9-aa26-e4a6b38123a8/rafatudijavexifegobo.pdf
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_dc6b6447558e41918db14c405a749dda.pdf?index=true
    • https://8b1d1a20-f0f3-43d5-aeb5-704ac988d6c7.filesusr.com/ugd/9dbc1d_38aed0a7856e4c7d941f55c2bbf7f644.pdf?index=true
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_2f821217d1824969a947e3dad401a3c2.pdf?index=true
    • 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_off00012941.bin
ba1ae86d0582ee890d97db3dd490f78b69e5a12a308f27ae72e9c3de942316c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12941 5600 bytes
font_01_sfnt_off00013c20.bin
894c2c1ad76dffbebdd4800ccca89f267990b436497bc0a1d4d56af77e72caf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C20 10748 bytes

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