Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21b6b26d7c975d7…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 10:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 49921b4eb2ff872106a263bdd67daab2 SHA-1: 61aeb844faa451212bb7a1aff45a4fc73cc28894 SHA-256: d21b6b26d7c975d703be230e7043d2964f175e31e08a86a31c86c9d7d0203d61
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-only and having a small file size, typical of a screenshot designed to hide a clickable action. Heuristics indicate it functions as a link farm on disposable hosting, directing users to external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pixomot.ru/uplcv?utm_term=ben+10+savage+pursuit+apk+download PDF link annotation
    • https://dpdpunjabi.myskoolapp.com/FCKeditor/FCKimgUpload/file/38018793682.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109201549161786.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/dd61796c6ca38141d75dfb3a45e261ef/sakotetaraton.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/43308207438.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/garajawidu.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/gowitadalara.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/zefijorase.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/tajexevegugigalodo.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/jerigifas.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/29823924513.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/kosogigifapi.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91094537224.pdfIn PDF document text
    • http://samtekelektrik.com/files/rurobisudogitiwedaduke.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/bewalegupewurisejaz.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/gutirikaxamixolatiwenugu.pdfIn PDF document text
    • https://atl-50.com/files/file/minepiludi.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137c7e11cc89---97208459762.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/85245081154.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/wafabozusejupalufeno.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/48181456481.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/pavupilete.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/18881473155.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/63242196287.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/98945894289.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_off0000b21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21A 11136 bytes
SHA-256: 69279695b340a55b8b9aef02408f2da06105f2f1bc8eb77f400746ec80409463
font_01_sfnt_off0000cc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC25 14036 bytes
SHA-256: cf3473468e0220f242ed53f588408355fab6c41c60891142b65e116991450de1
font_02_sfnt_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1