Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4957c4f38fbeed1…

MALICIOUS

PDF

90.3 KB Created: 2021-09-12 06:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cef54a55db7e507313ffaa848c680746 SHA-1: 4ec242c1d681d2dd7b2e55fda6cbbdc76dc18fab SHA-256: f4957c4f38fbeed13e561d5fc07fb75dad1eeb7944f931f9ba0036a4ffa1ae23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://isitekmuhendislik.com/userfiles/file/98122875079.pdf In PDF document text
    • http://artgrafika.cz/userfiles/file/92758752341.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/98649385411.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/47209672325.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/rovaperinodagadi.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/37292493068.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613278920950b---dazejana.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613341bd2c579---86485976527.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/diwewupowo.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/40367019371.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/75813960727.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210907_33AD2E6E7946240E.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/feliwa.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/rumexulogaworubifogederu.pdfIn PDF document text
    • https://greenways.at/userfiles/file/25497954759.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/57520240530.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090708511524.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/pagotekibotoderoxib.pdfIn PDF document text
    • http://fivelscope.net/fckimages/bojawefefuju.pdfIn PDF document text
    • http://berbun.com/user_img/file/finewaro.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pexagod.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/fonepekixutupigodavopida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=rejected+and+forsaken+maggie+ireland+read+onlinePDF 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_off0000f9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DF 11084 bytes
SHA-256: 2315afab2191f70a4c408e670b3cfd88a4460aa9d08a9c251369ed0d4f20e91c
font_01_sfnt_off00011388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9A 18436 bytes
SHA-256: d2bc7ae300c46a8c12449cc17437bbc5285ff7008be661fac51e8a8887b1a1a3

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