Malicious PDF — malware analysis report

Static analysis result for SHA-256 790655cd0b23f43c…

MALICIOUS

PDF

105.9 KB Created: 2021-09-13 10:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: adde4bd9cb2ece701543f5681b780162 SHA-1: 8ffdab71a72d5aced92498a3e2b676f6a17b9dc8 SHA-256: 790655cd0b23f43cabef2e07d8b6b23f4fc46094f116639fc49df700f52ef172
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://emprenderem.cl/files/41672586387.pdf In PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sapajumewijolonefuwuda.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/vinisop.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/fuwopomeketogesasov.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/95751d60d2a1b6bfc192943ab25cd537/pibezalew.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/547327961.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/suzufazuxatofuguwubijojo.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/52821321305.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/57977253504.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210905_121811.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/21515453316.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/51970738308.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/fabitotamufenewasofevafu.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/95203831485.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/75258073166.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/31323591757.pdfIn PDF document text
    • http://bankerz.in/qpic/files/86001987956.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/27986766600.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/94849254438.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-4/20210904133614646153.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/76173242052.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/64179932779.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109070455022024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mary+queen+of+scots+online+freePDF 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_off000135cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CC 10680 bytes
SHA-256: 104f945bb8a29f1f06789c52feb0f7940a471acd986a588098d9fa3eed5fcdb7
font_01_sfnt_off00014e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001668a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1668A 19764 bytes
SHA-256: 36708b1573933af5ba5fa3af494ab913d093bc2516e989c64d387949222e635b

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