Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84b2252f49b34fe…

MALICIOUS

PDF

71.4 KB Created: 2021-09-20 04:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 940c11bd8e792b99b4d2a13080b0e900 SHA-1: b46c1d131c7b2b8789c1c419bca48c56a10412bd SHA-256: b84b2252f49b34fed380979e097c72d422770debff126f150e56951c14bbc7b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pistant.ru/uplcv?utm_term=inshot+pro+2020+apk+free+download PDF link annotation
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/kujofoferix.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/wenudoraf.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/gilakejak.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210912120313.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/34178254973.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/34259784990.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/ninalenedo.pdfIn PDF document text
    • http://identik.hu/editor_up/kizinefikete.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137e156716ab---rojixakufov.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/94514497026.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/56825187834.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/xulorosobozamolaxizozun.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210918045356.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210913044530.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/73754874592.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/11049374382.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/68229191637.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/luvipimugijemenuxopu.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/tutobux.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138de12ac052---nunisavejidunezanos.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/44507410096.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_off0000b792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB792 15444 bytes
SHA-256: ef5df2a612b9bed32b61f62b3fa3b09cebb988d2a56bc8823f5103cbf4d31c9a
font_01_sfnt_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 10872 bytes
SHA-256: 3a9aee9ef4d0ea07673a50024c7f742e3e3f01c759b0018551217c5c48d75b00

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