Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76aed5573117152…

MALICIOUS

PDF

91.3 KB Created: 2021-10-08 14:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 6d4f74ec3d57762cbb895b7b58bf89b5 SHA-1: f0f3a61e43bb58874dbdf4a80439a31527a0505d SHA-256: d76aed55731171525cde7628c4f165ec7b3978ff13b21733153220e64191362c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and embedded links point towards a tactic of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://avsa.org/sites/default/files/images/files/28146242208.pdf In PDF document text
    • https://zhongzing.com/uploads/files/202109070434094752.pdfIn PDF document text
    • http://wwsm-us.com/files/file/vobubivubiz.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/94623008798.pdfIn PDF document text
    • http://ctm.it/userfiles/file/fimen.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/12140755916.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/fisula.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/50717015658.pdfIn PDF document text
    • http://nineslash.com/user_file/file/30306732032.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6cb32922eb27d9032aa5fe1365b679dd/88561362988.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/wazizorovoliwojanule.pdfIn PDF document text
    • https://citronel.com/userfiles/files/jarokeluvurojilukozoko.pdfIn PDF document text
    • http://220-wm01.netdbhosting.com/file/88836093971.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/ditunufuvuninelawevo.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614074c64b757---23167432463.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109101316467187.pdfIn PDF document text
    • http://hbaoge.com/upload/files/gowopej.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/kuwutajudejij.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/dobidenaxuviwurojalawore.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/55651212889.pdfIn PDF document text
    • https://hiroyoung.com/data/files/15999972582.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/zozamoroven.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=new+york+times+bad+journalismPDF link annotation
    • 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_off0000fbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EC 11048 bytes
SHA-256: a832362113c757fb2b3c1889fb4c015368ea906c1074d681dd51f15ec61d258d
font_02_sfnt_off00012daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAF 19560 bytes
SHA-256: fa23bd5ab8aebb66c02952d0b93e079f736635d5294d60d9b0a773e59d4f3bc5

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