Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11a70404fab94c7…

MALICIOUS

PDF

71.4 KB Created: 2021-09-20 01:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7023b63552e34c0bede28990afce38f SHA-1: 6f0218e7248d7ea016612f64328db31fce9a8384 SHA-256: e11a70404fab94c79d4ba0cdb5161d4c40dfd01eb240741f066f12e8a7a9fc7d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=cooking+cafe+game+download PDF link annotation
    • http://www.moyekolodin.com/files/68494159578.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/51978248604.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/64562624436.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/88611906992.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/45158285975.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090905552096.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/rofolasukanon.pdfIn PDF document text
    • http://adice-area.com/pictures/files/90568768981.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/68701114954.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/tudadivinevebuki.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/lujobuwujesajekepigobu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425220a0cfd---31251273687.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/piwivanumelodagazizivex.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/41578765089.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613707c5aa793---dafibaxu.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/75165661923.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/lurevof.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/73112054098.pdfIn PDF document text
    • http://newshop.jp/archive/file/58666192312.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/vekuwisadibajabipovobuk.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/nejazujojilelukux.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/30304792554.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/laweb.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/bawabipedonef.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_off0000b856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB856 15272 bytes
SHA-256: a6ed549c7ca78ca0855749b94cce7f05cd20405c7c789fcc2940c66475b5f58a
font_01_sfnt_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 10664 bytes
SHA-256: 831c37f7407da9ddb1bf94f7f909aa69fdd6076d0a42af03f52c2cac39e88abf
font_02_sfnt_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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