Malicious PDF — malware analysis report

Static analysis result for SHA-256 e447e42c39fdd411…

MALICIOUS

PDF

70.2 KB Created: 2021-09-15 10:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f6b7474196b8bd82d23d65d1a54a9b75 SHA-1: 2fa42274a7528a9cfb779ee2ab6d9c15511ae18f SHA-256: e447e42c39fdd411e0eb0eb457742c675c50c040e3b19d8c0ad5060ff03c76b6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript, which is a common technique for executing malicious actions within PDFs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous disposable domains, suggesting an attempt to obscure the true malicious infrastructure. The embedded JavaScript likely facilitates the redirection to external URLs found in the URL list, which are characteristic of phishing lures or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/pifupibolin.pdf In PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210914071408.pdfIn PDF document text
    • https://artbynela.com/uploads/file/62008461694.pdfIn PDF document text
    • http://santeh.md/img/files/pejesipirunimasejanitova.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/81016036764.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135440ed59e0---97392448797.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/17616820926.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/kiwovilejazujazimonuweji.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/795345806.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/diwitibak.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/furanadezaritizeduxojab.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/31762475642.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138e8f0b92e5---70097760571.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/95207884629.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/21928600682.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/60007840804.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/jugofokusutogoxatoragibi.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/juselefejutagoxegebalaz.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/diketo.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/jadinatenukixoji.pdfIn PDF document text
    • http://khocabien.com/uploads/files/tulad.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/tilixomasafelitobe.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/51416458111.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/14385603626.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/vufemexakon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ff+apk+filePDF 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_off0000b5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D0 9832 bytes
SHA-256: 872768fc1f10e885c0bbc1bc6e54bb807682725339a229abbef893600c2924f3
font_01_sfnt_off0000cb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6F 15848 bytes
SHA-256: c65b4cddbc4d2b0738e2285ff1026caafae0c99f67f3ac645ccbff87f4cea9aa
font_02_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1