Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc924e44ec8ea85…

MALICIOUS

PDF

77.7 KB Created: 2021-09-16 17:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43984364a7835236a43e3b51f69cc424 SHA-1: 78894ff6fce447dc8b47c146d9ac66d84ecc703f SHA-256: cdc924e44ec8ea856c0d1650208ce185c272ceab50fa69ccbfdfd4218822a83e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host many links on potentially untrustworthy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://catamma.ru/uplcv?utm_term=get+off+my+lawn+gangstar+vegas PDF link annotation
    • http://nuestratierrapremios.com/campannas/file/ririgenuzedodajuvux.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/83732009087.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/12442273485.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/87214410774.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/57726506674.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/5b6c318k2p2a26dd45al21lsq8/43571112295.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/81422634351.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/77292913890.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/51321617976.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/57024053180.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/74573144120.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/30076500877.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/634c0f7be0cdf5b6bdc771656debe2e7/zezemoxomanimipinu.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/11566479916.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/pagozadinosiz.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/99678648098.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/13582588625.pdfIn PDF document text
    • http://klpa.net/userData/board/file/77899988687.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/64872282737.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/31870628581.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/vazenevibalep.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/teribejebefifemubud.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_off0000ca79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28B 17612 bytes
SHA-256: ac048e28d87f272d2febc202a960a75f8de06203522a2557c11e8478f2424c70
font_02_sfnt_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 10768 bytes
SHA-256: 49bd531db9d43709f15ab0b893eddd38fe6d6341a10ac3073a5bc558b75a626f

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