Malicious PDF — malware analysis report

Static analysis result for SHA-256 099c4652bef7ee48…

MALICIOUS

PDF

85.0 KB Created: 2021-10-08 01:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cca6ac8df9347ec6534ae33154b84ae6 SHA-1: 92c02ee9ed3bab2fa3a2dc654520b74ee7822046 SHA-256: 099c4652bef7ee48eb5b9de8e042d24d257bb9a721681b4bd2b0d7fce776b2e8
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. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous external, potentially malicious, websites. While no scripts were explicitly extracted, the nature of PDF exploitation often involves embedded JavaScript for malicious actions, hence T1059.007 is included.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://unseenadventure.com/userfiles/file/9065561446.pdf In PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/xorezereloxiwamo.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/kanobifak.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210917034459_2b0ggg.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/vafutinenosoruna.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/22847105973.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/xakabo.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/epdd2dolium8rh5atk71h71cq3/davop.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/degedesokalopef.pdfIn PDF document text
    • http://futboltotal.net/images/files/wewonak.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210927105936130778.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/xorupofowo.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/gaxopanupomokexoli.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/sonomiwowirobelujemik.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/kajuvopufipodivexereziva.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/32968447587.pdfIn PDF document text
    • http://jiab.net/userData/board/file/52801644383.pdfIn PDF document text
    • http://kbchina.de/upload/rifapelufulewogemu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614192ef3e6ce---lugutomufexukefo.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/bekogaxugokowolax.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/juturirolujax.pdfIn PDF document text
    • http://yisin.tw/userfiles/file/68484314987.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/6705785523.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/xuvanofawuluzor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=interview+questions+and+sample+answersPDF 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_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 10900 bytes
SHA-256: 1b77b0610fab23b8ac1fe74bee736bc0559b29c319406e4d074bc2eac96b4b95
font_01_sfnt_off0000ff2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 18328 bytes
SHA-256: 967661d3499480ed1ba1d995ce201043db0b810adadd1eea27f6d2e9ea15fed6
font_02_sfnt_off00012e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1