Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1e423a38cd1668…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 03:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b432cf49e814ccd020e5539f3843ebe SHA-1: 6510f4860b5e84e8247ed8f6d2874073f62fcd04 SHA-256: 9c1e423a38cd16680e8ec075f44f98914e928b3e69d2859fc54b82bdc27c7513
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting, indicating a link farm designed to distribute malicious content or phish for credentials. No scripts were extracted, but the PDF structure itself is indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dtmaso.com/public_html/Imagens/file/bamemisatipomuv.pdf In PDF document text
    • http://bright-inter.com/file_media/file_image/file/17759076225.pdfIn PDF document text
    • https://ordermorestuff.com/cmsCart/upload/file/letanuvevu.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/15974244027.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/zaxunuti.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/81913689381.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/digizapowewifixa.pdfIn PDF document text
    • https://stormester.no/files/file/mavawevapukoxivojuxeworu.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/zitoxifivagugi.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/6132237028.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/jumetaxivudetoremaf.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/fivativumowesakuxolaj.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/togelifexi.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/jomumuri.pdfIn PDF document text
    • http://apothepharma.com/upload/files/giraxejol.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/fubopesegumuzatewijapuw.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/ropemowijotozavedumomu.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/koxomixodifijotulovidubu.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/43384422018.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/fukometejaba.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614979e53fe72---josunimepiguzikitulawoget.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/92640698614.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210923101427774.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sejugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=free+android+multiplayer+gamesPDF 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_off0000b159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB159 15996 bytes
SHA-256: ee1b8c1cc76d60f6b908e0922e4db61dca0bb68865e70ac1c96435aad5eb3485
font_01_sfnt_off0000da61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 10928 bytes
SHA-256: a310bff5260dc9d43e6362e48b6b3f69c8c457e911f1acb122867e1a135544ba

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