Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ff2e29f6bced68…

MALICIOUS

PDF

72.9 KB Created: 2021-09-16 20:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0e2f28d538ffb8770f015117fc7c2689 SHA-1: 5df53d0a5e8dd16931cd7beaa1ff38b341d1fab3 SHA-256: 10ff2e29f6bced68ab712eb599cc25d28c5766f9fefef20afbcfb7512249adad
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The embedded JavaScript stream and the high number of external URIs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=heart+fonts+copy+and+paste PDF link annotation
    • https://remini.hu/userfiles/file/jovuxudinovunuxumunifa.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/69283616380.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/48273687841.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/toratapojotare.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/2432695470.pdfIn PDF document text
    • http://rapet.hu/files/jufomis.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/26673507859.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/jamulenavigolonuxovafer.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/gumiwu.pdfIn PDF document text
    • http://speckrepej.com/upload/file/pigoloxemenolomolufo.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zarafepikawuvufidunozun.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/49916190764.pdfIn PDF document text
    • http://cocoal.com/uploads/file/73426246269.pdfIn PDF document text
    • http://scarpatti.com/files/keguni.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/luxitadobazunaxur.pdfIn PDF document text
    • https://ijp2.com/contents/files/40946866308.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/33242770741.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/tefadudamojofuwo.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/366b8763fb67b7f566e9929524ff4b8a/kulanejexulonezifozivap.pdfIn PDF document text
    • http://dasbluemchen.com/muwezefin.pdfIn PDF document text
    • http://ipllaser.in/uploads/99329792990.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/navilow.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_off0000bad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD0 16520 bytes
SHA-256: 9150304aeec1e7cf64966771a66f6c4971ec8f92e306823122d2dddbe21b1ea6
font_01_sfnt_off0000e5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 10580 bytes
SHA-256: f1091dcf1aefb57083a20514890594231c00a57045bb62b17f2e8e5621ff5336
font_02_sfnt_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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