Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2abc95a8ab23c9…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 18:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 216e38581a3fab98671c21b3809b947e SHA-1: 57d1a5c3da32262d69aa9d99f875dcc1f41a3d36 SHA-256: 5a2abc95a8ab23c962edbeed00a659fccb89b9faba58dd20365148af6007ba98
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests an attempt to execute code within the document, potentially to download further payloads or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://secondhandgraphics.com/usrfiles/file/30859883195.pdf In PDF document text
    • https://uclerbaklava.com/resources/file/xevoso.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210911093755.pdfIn PDF document text
    • http://ranchobg.com/img/file/94279831552.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/10241951251.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/67513176740.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/17754633569.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210911221054_alkis7.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/roxuk.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/54518117316.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/1914558926.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/polakujepog.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/41015440989.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/15963595050.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/49493111104.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/94521741535.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/60625535183.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/rakawaleb.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/gogoxofuvatufusa.pdfIn PDF document text
    • http://saaretravel.ee/images/file/80579326685.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6407944d5---27042422358.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/33240946801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=play+store+app+free+download+for+pc+windows+7PDF link annotation
    • 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_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 19136 bytes
SHA-256: 1fee57ac039b12de0ca41b4e3297577f2e8a5130a3f8f14651bf3e104a573182
font_01_sfnt_off00010ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBE 10864 bytes
SHA-256: f8bb90349543d18da1b3ec66d0580881c548abfe9931ae14956dfb0e0ec9f596
font_02_sfnt_off00012827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1