Malicious PDF — malware analysis report

Static analysis result for SHA-256 36340b511f00cddb…

MALICIOUS

PDF

107.1 KB Created: 2021-03-11 12:40:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 370fec7d3f59e2610e89012faae44971 SHA-1: 5a1ef048c7e1adbb6897ceb6c207ce125e305e90 SHA-256: 36340b511f00cddbd264dbe31d7dafe551dadf9c0982d1d51fd6a8257213d315
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=toefl+sample+test+with+answers+pdf PDF link annotation
    • http://xeeewq.xyz/rejogulevagenajerazelevad5ihbe.pdfIn PDF document text
    • http://peludofnor.fun/do_you_need_a_license_to_do_lash_extensions_in_ohiozdzry.pdfIn PDF document text
    • http://invitesistem.ru/sniper_ghost_warrior_2_walkthrough_part_1kfk10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5fec2eba672e9.pdfIn PDF document text
    • http://presalon.xyz/kukojusalewacmm.pdfIn PDF document text
    • http://glasshookahcatering.com/appraisal_checklist_form5ta94.pdfIn PDF document text
    • http://pinegrvuig.fun/51147904823m2iki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371800/normal_5fcb5abfa965a.pdfIn PDF document text
    • http://medway24.com/dukunupa2qew6.pdfIn PDF document text
    • http://prizinsta.online/10634197532iyez1.pdfIn PDF document text
    • http://smilex.club/pefubolisomazororifduec.pdfIn PDF document text
    • http://about-igsupport.com/pajuwagolagw2c.pdfIn PDF document text
    • http://vittorguxx.site/gatiwosetela5sevk.pdfIn PDF document text
    • http://astrology-personal.online/free_political_campaign_design_templatesdpgk3.pdfIn PDF document text
    • http://fringigejy.site/keeping_the_republic_7th_edition_fre9d17u.pdfIn PDF document text
    • http://tertov.xyz/sapilorigokttfzs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465147/normal_6025e59675630.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d5dbdc9-c6c1-4e27-80dc-893fa46536db/yamaha_704_remote_control_trim_switch_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad18c213-be85-47c3-a7e1-cf81034ea2d2/sasajojegofewawifurubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ac6ee19-3229-485a-96fc-6e5ecd92a38b/didukijuwojedegejidam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b19330bb-87fb-4e30-8ae7-6cca2149f707/relepujenalitujipos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40c79b88-67f7-4ac8-a63c-d3c11e18c473/seed_minecraft_1.15_2_island.pdfIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_d4de6b67cf1240f5948092869e314d3d.pdf?index=trueIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_d316d7d409cd4d65b703793f27bf5ea0.pdf?index=trueIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_aadaeb7fe7a4439aa33d4a5500d52f3d.pdf?index=trueIn PDF document text
    • https://78832258-a450-4746-8c2e-8ebd7c1eaafe.filesusr.com/ugd/c4f63d_1a0fa21bb60b4b7f8777065a16317fbe.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000147cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CD 5324 bytes
SHA-256: 9378044d3eabc0ae1df951542674a8f17e56046e95d2bebf090f70fc73495650
font_01_sfnt_off000159c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C3 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00016251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16251 10916 bytes
SHA-256: 056c31cb76ac015809678cf8539ffda89a5ed2199b73c8a1ca7a6686bcf6f2d4
font_03_sfnt_off000187a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187A1 16376 bytes
SHA-256: c3d0ee408bee49a88931d2ac630a9fb52e88a46fabab5a72aa19e78bbe1d3826