Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b35482dfb70419…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 00:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 16881bc6bd8c5500f08b4efc9ea22f05 SHA-1: 8dd1600662a3b8aef83ce9288df021c3a88f8d7c SHA-256: b1b35482dfb704198420e39267e546c2ac83d2d3cda350bf0fa0f45f17b0e81e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URLs, many pointing to PDF files on disposable hosting, suggests a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically indicates this behavior, likely as a precursor to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=android+geo+tracker PDF link annotation
    • http://www.sosonomo.com/ckfinder/userfiles/files/vixuwo.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/rotiwudivuruza.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/11883231206.pdfIn PDF document text
    • https://ultralloy.net/upload/files/25455687999.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/sexifigi.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161446f7343240---gurazedevovijobujunejo.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/91270924050.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/90032508827.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/fufedezegijutokuwufuxewe.pdfIn PDF document text
    • http://meta-min.com/files/ziloxifafawologatasotesaj.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/deleto.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/jufixerutilovepopobepaf.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/4271550629.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/vewavoda.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210902100750_1685255503.pdfIn PDF document text
    • http://tchid.net/userfiles/file/xugebirepopefajoxufixexu.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/17456479981.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/57939696029.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/kixewefivovupoxozizuga.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/mowiwoxafanupepapekubil.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/mixelaxosowavuvote.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/wokuvosifewogebuwujig.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_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 10404 bytes
SHA-256: 498319ef6b5f3614b8889bc97821f16a1919e68656d3570ffeaf8e6bd8c53f7a
font_02_sfnt_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 18080 bytes
SHA-256: 24719f9c8956c6cb9d324263cf69277217cf6c8701993596c29290c5445476ef

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