Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1774b16c17c6e03…

MALICIOUS

PDF

85.7 KB Created: 2021-09-21 16:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2860554e60b51166a8440d8355986c6e SHA-1: 7b7447dcc48680216ce8e4bfef64c9a90c3fac20 SHA-256: c1774b16c17c6e034c509bfa96c28779a183648e0f28bff078927d0bd3727149
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gptools.net/userfiles/file/pizejususesizu.pdf In PDF document text
    • http://pmrs.ps/userfiles/file/dabefidezawonulab.pdfIn PDF document text
    • https://wsbtitan.com/images/file/69521650398.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614633bde6958---55146468576.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/gizarugax.pdfIn PDF document text
    • http://geoman.cz/data/file/lasegivetodid.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/renaludevogumopo.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/71641368568.pdfIn PDF document text
    • http://whatdwellswithin.com/file/85995422395.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/80458661943.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/47838972767.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/26608704875.pdfIn PDF document text
    • https://jagominum.com/contents/files/vukofimikizipojiguk.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/58164838502.pdfIn PDF document text
    • https://sopkambing.com/contents/files/zenudasidegonub.pdfIn PDF document text
    • http://petrduchek.com/files/sarovema.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/vidojusurufunowexe.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/nunegoputebonedofuwide.pdfIn PDF document text
    • https://anakmeong.com/contents/files/46825728087.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/manajivitewiruvidukuw.pdfIn PDF document text
    • https://asi-filter.pl/files/file/ropadedibefanelozu.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/84077686409.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/81442007198.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/laliguranugopefagamewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+book+of+dead+philosophers+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_off0000e8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F8 10588 bytes
SHA-256: efc137c9be0d73cd89562d9f44fd585df111072854d7c0590f2f1e6b42ed519b
font_02_sfnt_off00011901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11901 18436 bytes
SHA-256: 1dc904c4200ee30e8a5c93c0250d04f5a4c414115a390fcb349e215a9c93a019

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