Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b45a48c7ec2271c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 13:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1a3e4bcf6cad263952550924e62a85a9 SHA-1: 9ef09ab85d13567083435b69251291094dcf6787 SHA-256: 4b45a48c7ec2271c37c4fa1cf528c2dd2da014c64d5543521a18488b0cce7b53
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate it is part of a link farm on disposable hosting, and one URI points directly to an IP address, suggesting a phishing or malware distribution attempt. The embedded JavaScript is likely responsible for initiating the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://granitabrasive.hu/editor_up/30892800213.pdf In PDF document text
    • http://carshopm.com/js/upload/files/megilab.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/tovutisusonenen.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/10012020936.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/wuzajadetororixixal.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/25591597679.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/vudakazuvupup.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/90544349881.pdfIn PDF document text
    • http://espwireless.net/uploads/file/53289664486.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/29bdb470f8df38dba3c0d47992422fa7/xepog.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/36936788680.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05303e15a---filinopifezevu.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/jabutixovipijusuju.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/nukijoxitoxemifelovororab.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/kurexesazorut.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/pibad.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/25216987929.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/zixubo.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/4645675854.pdfPDF link annotation
    • http://ghefootmassage.com/fckeditor_userfiles/file/38561545122.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/84307132004.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/51549127447.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/xumibikomakevun.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/seroba.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/mafej.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/11446760653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=super+doomspire+codes+2020PDF 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_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 10680 bytes
SHA-256: faf09ea74023fa78a8477f95c74b09ed81f75017dd166518bee1e672092bd9fc
font_01_sfnt_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 17708 bytes
SHA-256: 853d56218579f73007356ae68690b1bec79ebc9e024f3e1bf1fdab851d2a327c
font_02_sfnt_off00011f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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