Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba679732f0a9f4f…

MALICIOUS

PDF

76.3 KB Created: 2021-09-16 03:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 824b0373fd6844318faf9c40708d8063 SHA-1: 0f5cc2219eafcada2aa079f64c33b6d4de8ff6c3 SHA-256: 0ba679732f0a9f4f674a417c1b638b0feede36e2c631e2dd3eace6f2289dd890
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing malicious software by posing as a necessary browser update or extension. Numerous external URLs are present, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://medvor.ru/uplcv?utm_term=how+to+remove+ads+in+apk PDF link annotation
    • http://jx4d.com/userfiles/file/lobebevizezixa.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/59442483487.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/15975727533.pdfIn PDF document text
    • http://mobilenmr.com/files/files/69127642988.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109010811363411.pdfIn PDF document text
    • http://surestegc.org/documentos/file/bozufugorokeweziganorizum.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137d03c51ae6---40630452450.pdfIn PDF document text
    • http://umhouses.com/uploads/files/kolafu.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/82917644201.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210910160439.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210908124442.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/rinexokokawosegifirugi.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/91758454621.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/42494118620.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/54150369536.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/27472935764.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/91353709741.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/wesogoxepawi.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/sefobusoriz.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/43795067488.pdfIn PDF document text
    • https://cardolf.ro/files/85896819072.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/99467313831.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_off0000c582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC582 17504 bytes
SHA-256: c205b7548cfe09d568d139837085970b807549a0b44cfe7cbdff4432b2c1a702
font_01_sfnt_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 10740 bytes
SHA-256: b9d242bd0ab7b921ca9d762a95c52a563402037a6b41deb36618a89797fd5777
font_02_sfnt_off00010bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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