Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca50947913aa5f0…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 15:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b708ac5788ac3c56dd457f156a5c7a0c SHA-1: 994da76addc77736bbbea00b766b815be945a28c SHA-256: bca50947913aa5f0f91bd1939376e436c0827fe15d27f4f04b0db53251fae7dd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

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 https://catamma.ru/uplcv?utm_term=craftsman+apk+ios PDF link annotation
    • http://www.icareonline.net.au/ckfinder/icare/files/nolipunemabodezevawig.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/kijufoduletokokegokuzifo.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/mixaf.pdfIn PDF document text
    • https://autoskola-scp.com/files/dosikizepigobokawobuw.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/maresofut.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e5d6db8fa7f47c38b0c199b2fa628e35/limowiborumazir.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210911022542.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/18850593115.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/dojaxe.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/98803341513.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/76414745781.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/49370847963.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316889cec9b---64983997362.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jifibokosuxitudizoka.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/45907343865.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/36833559569.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/43232441444.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/pufafixudezakafodufi.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/43621138752.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/libenonuzixugiwanaxaxiruw.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/80103756200.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210906030946.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/87238918373.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210908_234900.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/31057516515.pdfIn PDF document text
    • 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_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC63 17456 bytes
SHA-256: 31307fe1e0ea96033768e6039382f7346a9df364f84d20de4a949e52cedeb3dc
font_02_sfnt_off00012a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1E 10464 bytes
SHA-256: 9093fa8a232dd47c619d890e0a42c5697334609a664f5ba6bf127d5dec994965