Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fcb3b560df1b30…

MALICIOUS

PDF

74.9 KB Created: 2021-09-16 13:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4276996d433c70987cb09b6b85b259fb SHA-1: afc2434236aa3a0457a4e5875bce71ce40dd67cd SHA-256: 90fcb3b560df1b305d7d18bea70b02da2193a40c53f5c5726178cbb436caa94a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The presence of numerous external URLs, many pointing to PDF files on various domains, suggests a link farm or redirection mechanism likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://canionglobal.com/FCKeditor/file/28492896668.pdf In PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/99039356662.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/rotavimejojab.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/68764697525.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/69469721773.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/tefopigifirefov.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/52178116832.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/52241173703.pdfIn PDF document text
    • http://hangquangauto.com/files/66936242807.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/45251401724.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/71092493303.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/jikiterojosokazo.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/piziw.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/rulufarivivowakatuw.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/totibinaxo.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/47238289433.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/18846494267.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/73500401042.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/166d5b05ebbcd3d196f71d9d99bab31b/48159020487.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/81856405818.pdfIn PDF document text
    • http://zenithmetals.com/files/bogariz.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/xesexasujewudimofi.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/tifirabiwikomogewug.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161417123bc5b2---pekamegobobiraze.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/59051525795.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/91380832149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=gps+on+iphone+8PDF 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_off0000c35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB71 16972 bytes
SHA-256: 0a5a5e9e1ebf8a95007fa9b92a113eab4dbf05568faa9532e09feb603a9cfdd0
font_02_sfnt_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 10188 bytes
SHA-256: 404e0af168cd2063be0be9f5142293c30370aa6aa5306788e5a1eaddbd5d8f46