Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c2e0bdcc941486…

MALICIOUS

PDF

83.8 KB Created: 2021-09-10 05:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4369f214e25a95a6beda560e8e5c2edf SHA-1: 698800b3bb46218beb31d44d5b8f1070077a3cbe SHA-256: 16c2e0bdcc941486a1ef64f3cc485068b2af7097552dfb644d4d51332afbe9ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by multiple heuristics and an ML classifier. It contains numerous embedded URLs pointing to disposable domains, with one heuristic specifically flagging it as a link farm on disposable hosting. The ML classifier's high confidence score and ClamAV detection further support its malicious nature, suggesting it's used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://enilubricant.hoakhanh.vn/uploads/image/files/wasuk.pdf In PDF document text
    • https://rotitelor.com/contents/files/86865906938.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///zununodopafagividu.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/75259551707.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/75706591517.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/fusapenamifiteru.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/tojisojukuxedebolu.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/tolefeveferuretoxiz.pdfIn PDF document text
    • https://digireg.se/upload/vigidezuz.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a75a16ee56635b45f9e3c8264d026537/bagibodemosuwi.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/69192843410.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/22737084859.pdfIn PDF document text
    • http://azizolace.cz/images/file/viwudoxekibasivub.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/fofuxenupubaj.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16138f8fa1429d---gafilumixule.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/48787383600.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/82087376445.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/vidirise.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131d46c2bcfe---nopisulirewinewoxosutowe.pdfIn PDF document text
    • http://centronegozi.com/public/zozobutepunamevupovut.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/sifimaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mobile+application+projects+with+source+codePDF 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_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 11060 bytes
SHA-256: 53d6552a20781f024c43bd08b5a39c05be3e4f1ef2f572a4175443a93360772b
font_01_sfnt_off0000fa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 17960 bytes
SHA-256: 31e8d3273aee65aeae98bf86cee8d295569c14d4e216f5fd001c9f7bcb47b44e
font_02_sfnt_off00012976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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