Malicious PDF — malware analysis report

Static analysis result for SHA-256 318f69ac523ee218…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 04:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4c53cd082435136b54a93748b01b597 SHA-1: 1941d189b6266fdcc9b10700f6726017950fe9f3 SHA-256: 318f69ac523ee218495f4e5ddec36ffde4537ff871dc8623d2cfd9c544e34b0f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to various domains, suggesting an attempt to redirect users to potentially malicious content or phishing sites. The presence of external URIs and a download button lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=metro+2033+noclip PDF link annotation
    • http://aan.kz/ckfinder/userfiles/files/26101469474.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/8bdb617c6769b73852778e9504efc251/vomodol.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/tofekoramusakosazifapados.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/5097235155.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/40638031118.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/2643529624.pdfIn PDF document text
    • https://oasis-travel.ro/files/24721796507.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462b76cd8a1---82194913435.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/89043752801.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/kizuberudotenegabiwowej.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/20752522180.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/tunonerekesi.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/52701593456.pdfIn PDF document text
    • http://moretonassets.net/userfiles/93584003448.pdfIn PDF document text
    • https://pmms-online.com/assets/file/50463115855.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/20728849519.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/lenekuwefigo.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/72996124279.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/gelunukagunibumasiwojufi.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/pitirudidedazadipanij.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://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_off0000e10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10F 10444 bytes
SHA-256: 35efeaef0862b5844185abb4f4cc4a243817ad1b960ae34f042709e4869bc2ee
font_01_sfnt_off0000f8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 19556 bytes
SHA-256: acd08f85ce2cc67f4e382a1118109d947a55de0718cdb808c5024f723c2d5285
font_02_sfnt_off00012bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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