Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d181b0aa4fc4427…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 22:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 500c37d1f7676534bd2692cd11be9c8d SHA-1: c9b6d40ed937bb8596347559e5d71b4d4dad0c9b SHA-256: 9d181b0aa4fc44272de5461cd1dcc05757076698c86539305356c44b984cdf8b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs pointing to disposable hosting, suggesting it's designed to redirect users to malicious content or download further payloads. The presence of a 'download button' heuristic further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • 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://drafthe.ru/uplcv?utm_term=sufna+movie+watch+online+filmywap PDF link annotation
    • http://nhatrangpalace.vn/app/webroot/upload/files/27530827934.pdfIn PDF document text
    • http://master-vin.ru/files/file/pajedomubor.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/50157318821.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/26725696974.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/mijemuruxefojozumew.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/96581425349.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/5020261631.pdfIn PDF document text
    • http://geraldinekilkelly.ie/pofixilubifu.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/lurufutefe.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/supixuko.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/zotutejaxavawilovumas.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/liziza.pdfIn PDF document text
    • http://dungculamdep.com/fckeditor_userfiles/file/nukulaxadevumiwuput.pdfIn PDF document text
    • http://hadt.vn/upload/files/lawopojozoxapanunewu.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/86584233021.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/67149624408.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/al7nkb8g4mfb6g6kapd7j7o4e2/nusavixolumubaze.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/68488256737.pdfIn PDF document text
    • http://kco.su/userfiles/file/65678653465.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130339b36b9f---pabipafozeluxuvotitan.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/21295876513.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/retitedosoji.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/fitozinovafefafal.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_off0000ddf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF4 10916 bytes
SHA-256: 6a3ac10ebe531182876c585eeae70787368f60cb9b64a769eaef12b5c1fb4cae
font_01_sfnt_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 18460 bytes
SHA-256: 6c07c26107c8573aa77a3f5a24b7134ddd27012f0bc70311cc05483d58743e0b
font_02_sfnt_off0001271c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1