Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1285a521a61561…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 22:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2333e8387005db5a14f2b57863d6d03 SHA-1: 50918b015f507d2a146e2d61f0a486c5f5dc7df5 SHA-256: dc1285a521a615616e968346f9b6a6bb1336ad6f706c37744db193d5bf98ac3e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many of which appear to be part of link farms or disposable hosting, suggests an attempt to redirect the user to malicious content or phishing sites. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=how+to+screenshot+on+a+note+5 PDF link annotation
    • http://revucue.com/ckfinder/userfiles/files/52652832202.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/24691026134.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/vipixanupovitexafen.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gimokitofoponezezev.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/22976160025.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/71057529082.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/xaber.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/51987231600.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/wesudatoranepiveva.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/wokaxedap.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/99881544842.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/vebuzunojuba.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/kumagatoxekukuru.pdfIn PDF document text
    • http://onelove.cz/file/xoxukidagotalapirodetumi.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/8501754274.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/xepolajalijegine.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf275b1a3---16692430081.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/vurij.pdfIn PDF document text
    • https://ekransamara.ru/files/jeturidewuna.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/1887163920.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/nejubisatesan.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/19160594581.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/zuluvubevenegonirox.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/80771549067.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_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 10400 bytes
SHA-256: e133f0a2a192d9fb7695b31a9be9567c4820c66277b2ad25ab024e85112308b1
font_01_sfnt_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 18296 bytes
SHA-256: 10d0e32c874f1f6d846ddd288caec2d8bc265fdd59a085bb444c5dd978a436c0
font_02_sfnt_off00012e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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