Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b53d8fb29550238…

MALICIOUS

PDF

92.3 KB Created: 2021-09-09 04:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 802a49628809352c5609dd255785d4b9 SHA-1: 465c6c9db4a61efbb951f9af03a7acee520edce8 SHA-256: 5b53d8fb29550238f2abfc57254b04aaa93876ff2b863952c05f5cb5b5e910c2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded JavaScript stream and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document is part of a link farm hosted on disposable domains, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://coretry.ru/uplcv?utm_term=war+full+movie+filmyzilla PDF link annotation
    • http://dezis.ru/uploads/files/bixopizeginesesamapu.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/lanepaj.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/larawitikelokoxi.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/69555354590.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/3bd14219a8fc67b4e44e6a502c26a00d.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/921fdc6272a0513d510f095ab05ecbf8/xefes.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/22758556690.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109080711201659.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/tepebezosidasanofinixoxen.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/vowededenitusotitu.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/bipuf.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/lobiw.pdfIn PDF document text
    • http://myphamasia.net/upload/files/zujixifimorojutonavoxi.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/pusefara.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c0a362b96---65924820372.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/sonefuwufamu.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/dovaviwabol.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210902212035_579572368.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/73174798437.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/zibukem.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210901181829.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/zibakew.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/84743476524.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/nowusituv.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/mifoporofutowosatakam.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/96981540911.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_off0001070e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F25 10336 bytes
SHA-256: b5ee7ef284153a9ed006c775c1cb6f1c3934bd7d99fb5800712a784a5f622f0e
font_02_sfnt_off00013683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13683 17316 bytes
SHA-256: abaee8238f13fc20f8d6b755a7b0b4d61d4f47b40730195e36ab3aaf448101d6