Malicious PDF — malware analysis report

Static analysis result for SHA-256 450994ff265a8b06…

MALICIOUS

PDF

104.1 KB Created: 2021-10-08 10:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 23fde7edbf05cd1ce418c96562ab71c9 SHA-1: e6310c6f932e0ea3e6044d0c261530acd7bb198e SHA-256: 450994ff265a8b06c079795cb6a183a52f2f7dcb03b85abaa8414dbdf00316c9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://archism.ru/uplcv?utm_term=mary+queen+of+scots+tim+vicary PDF link annotation
    • http://yejiya.com/userfiles/file/60869682435.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/foriremobamibosodi.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/92923464023.pdfIn PDF document text
    • http://nemochem.cn/upload/files/wobirelazemozoxogevun.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/sewekizosufogixukuwigaxow.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/80219799298.pdfIn PDF document text
    • https://arerp.kr/data/file///rusomukotudilirumevum.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/selebirawe.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/kuvodeg.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/powilesowarekovanefopew.pdfIn PDF document text
    • https://agermag.ro/mm/file/53060046532.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/xijafetifu.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161419bad647fb---sotuxujatexurisulur.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614636b6809a5---daxemesozaz.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/gifagetamejulilugufivo.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/jigakoterazumejafotozeb.pdfIn PDF document text
    • http://cutskytools.com/d/files/87027000097.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lawujulup.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/laxurel.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/901397022.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/16344321096.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/76369872435.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/73305332238.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/tigatisolerifiboweled.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_off00012d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4C 10872 bytes
SHA-256: cadec7194ce23a61474ff4534f295f245437d7fc4818ec5b579c2c78cacdacb2
font_01_sfnt_off00014683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14683 20340 bytes
SHA-256: 6212750f23a47a1366b17052fb5f9f7be5610cfb4aebc987443bac1490797118
font_02_sfnt_off00017a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1