Malicious PDF — malware analysis report

Static analysis result for SHA-256 e376b9c2faa1063f…

MALICIOUS

PDF

88.9 KB Created: 2021-09-12 02:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 553732affc07671a6d489a6bfeaa582c SHA-1: 42bffa4883ff308d3211f779ef29bfd59f947e33 SHA-256: e376b9c2faa1063f5034a46fa3bd127168012fbc8d4449a72a5e57c32484357c
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://electriccityusa.com/images/fck_uploads/file/bosixuwifida.pdf In PDF document text
    • http://medica-eg.com/userfiles/file/tefijukitevokuvibebig.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/2f383f75c93a19dda3c974baf7c9124d/lafunedinasibodineluwoxez.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/vitekibikuzijegijuta.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/muluzisasatuleji.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/loretufibopuza.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613149b55b630---51792952163.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/50932767128.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/42399612913.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/24940092360.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/68681734325.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1630573222311428173.pdfIn PDF document text
    • http://thegioioto.store/upload/files/najir.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/34648274889.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/tukafonurupofew.pdfIn PDF document text
    • https://phr4u.com/files/vulipigutedafunabutital.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/82627923276.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/62042888059.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/jilidoduv.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/maxarumadutosujob.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/voxasiravas.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/zobanaviwapesenakiwuw.pdfIn PDF document text
    • http://screen.by/images/file/10778749530.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/22979149566.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/91930642342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=warhammer+40k+white+scars+codex+pdfPDF 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_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 11208 bytes
SHA-256: 3b408f4cb6225d25ac73067630b0ee694fef63b69865830f9ed4d6492ddbac22
font_01_sfnt_off00010d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12547 18828 bytes
SHA-256: c35954bfd14c20e3a6f6f58886e5dfe14c42699a06c197df5a5fe6fe85c43290