Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63f62b268a57070…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 04:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6c5a17ddc3dffbaccbf86c1ab452f78e SHA-1: 1dea061448b6ae9675d21ce441c5cffbce0c07ac SHA-256: a63f62b268a57070de438dafc849e932f524e53be9ca1cbabfb8bd69d679f893
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to link to many external sites. No scripts were extracted, but the presence of numerous URLs points to an attack pattern focused on redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://sfeerweter.nl/userfiles/files/74698148081.pdf In PDF document text
    • http://autovoda.ru/upload/files/77139387144.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/gobexerezilawilisokogarap.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/4516432895.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/lolexezafarumigekudufo.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f11425cb3c---nituweze.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/58553300176.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/wevukefuduzomixuvedom.pdfIn PDF document text
    • http://atomleasing.ru/media/File/rumikusuxifa.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/28086160471.pdfIn PDF document text
    • http://wenxuezj.com/images/File/9618012624.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/vidaxiz.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/guvifisevunorobofidibowa.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/mikugutipojolanidovax.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/sagasavoluruze.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/lujogawasowidojenekubuxo.pdfIn PDF document text
    • https://limsurdua.com/contents/files/dibipuzifuxiz.pdfIn PDF document text
    • https://thietbigas.net/media/files/zuvumajilu.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/neleg.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/47860543275.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16143e08e5821a---61834539010.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/93255871186.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/woxunuxorifep.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021091100075673499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+bollywood+movies+online+freePDF 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_off0000d360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD360 17348 bytes
SHA-256: 98ed536cae4e76d7558f986f296c0ad153886c41feaa720d2c3a09dd7f459b75
font_01_sfnt_off00010081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11898 10824 bytes
SHA-256: 0fda0a3123238b1ee75bdf1cb15c61cb17318af20f2593045c8424df267ed6fb