Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d247628d6dd41b5…

MALICIOUS

PDF

84.7 KB Created: 2021-09-15 12:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba4890540c67ec77effa3890e0fc3b48 SHA-1: e98f917f2e72c170bb8d75b05c0f647838b6bd37 SHA-256: 3d247628d6dd41b5ecfb43c39a85f34f0dcde0fb8ccc6f0f775fe942638781d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URLs, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the 'link farm' heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=pixel+gun+3d+mod+menu+apk PDF link annotation
    • https://satesayap.com/contents/files/moxigimovifumafenipodek.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/99197621156.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/ziwafa.pdfIn PDF document text
    • http://sdes.in/uploads/82368555422.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/sukojeb.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/pinakalarag.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613916a5b3e4d---42155393475.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/wifujurated.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/gabenapivunozefobital.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/wimifezinobufine.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/52603985359.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/zatavaworipololeniziwab.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/59299600096.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/laroj.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/73566793378.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/sesarirufaj.pdfIn PDF document text
    • http://elsped.hu/files/file/dajikatobepuvuwagawib.pdfIn PDF document text
    • http://clingac.com/d/files/7234392746.pdfIn PDF document text
    • http://lj-group.cn/upload/files/nexuram.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/zaduzekef.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/25169396678.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/36995262558.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/98284748138.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f74744337591b755414cbff358ab78c1/95855741851.pdfIn PDF document text
    • http://vkts.se/userfiles/file/visavakutuvokafiv.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_off0000e0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 19784 bytes
SHA-256: 040e3c21b9b0ee49aa8448f1f528d8318d22ac18c8d57590fa8785da9c582712
font_02_sfnt_off00012c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C59 10836 bytes
SHA-256: 765ff58d98a1c922370fe712d2da11b34b280b90cec3de622b5d4c34b3682047