Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d94e8d873dc23df…

MALICIOUS

PDF

75.2 KB Created: 2021-09-10 17:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 881e8f01cafdb0bd46980affbb344890 SHA-1: 42e7cecd07cbfd63f2f7d858970859d7b448d080 SHA-256: 1d94e8d873dc23df8854bea14b61cd6c4e288835d79b5bbef7512ace64aa5af2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=object+distance+for+convex+lens PDF link annotation
    • https://thebottombillion.org/business_school/uploads/file/bezev.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/27779906875.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/kowinodekekozutaxa.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/wexerofomiwipozasegiso.pdfIn PDF document text
    • http://toroisg.com/public/images/files/35264859799.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/jojinarirukugunolaf.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/65678315214.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/55417102539.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/wavijukowugagujizavodu.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/zarakavivirojekives.pdfIn PDF document text
    • http://kasargod.net/uploads/file/43887708404.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/nelipabifevexulewoke.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/63341520604.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/40281292804.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/47719535899.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/tobokumegujif.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/pegotivujibakap.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/pobopuvamev.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/35235771930.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/zovewenorega.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613834b18b826---95837744778.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/72239351168.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_off0000c3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 10932 bytes
SHA-256: 536db0cd20b9f6364665cfff3957b834f9e6aa6637b84e4a04436cc2c24312e7
font_02_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 16324 bytes
SHA-256: f22848b9e18164da3d0b129a61ddc3373405fe4946b159c8f7dfcf211390955e

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