Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24829fb22492930…

MALICIOUS

PDF

80.1 KB Created: 2021-02-21 21:52:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e249ebcecdeae16caf50e28ce423c166 SHA-1: aa2820cbbd5c90be0f8cba8b108a5d59dbb80096 SHA-256: d24829fb22492930ee4df188cc00b06ca3400ffa340c5f946e8726ffc9e9e6b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/123?utm_term=what+does+not+lateral+thinking+mean PDF link annotation
    • http://alexsaf.ru/92721611122z55of.pdfIn PDF document text
    • http://nezebesupojava.22web.org/c_primer_stanley_lippman.pdfIn PDF document text
    • http://naturka.space/surah_yusuf_download_freefgzz6.pdfIn PDF document text
    • http://sadovik.me/emsisoft_anti_malware_freeware5svuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413866/normal_6013065466571.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411252/normal_60015d7524c57.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/eshiWBW/hallmark_drama_tv_listings.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/ggjPSBh/bifalinotut.pdfIn PDF document text
    • https://cdn.sqhk.co/gipekoma/TqMnjcy/59864853115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418192/normal_600d1901f399e.pdfIn PDF document text
    • http://povar2020.site/340801030252bs3d.pdfIn PDF document text
    • https://cdn.sqhk.co/tifapoxur/Ughx8dy/mapaxaxojewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452392/normal_5fd26fc86e848.pdfIn PDF document text
    • http://fitukogamoj.iblogger.org/converting_measurements_worksheets_grade_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wesovipimamino.epizy.com/coliform_in_well_water.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/free_hd_wallpapers_1920x1080.pdfIn PDF document text
    • http://suzawelo.epizy.com/mojemekidusowesudojowo.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/weretotetukuxowogo.pdfIn PDF document text
    • http://gebuzabode.epizy.com/zowodipulidawepon.pdfIn PDF document text
    • http://migegavirunafo.rf.gd/puvezelirowetute.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/69384391980.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/fuditiwotixilaramajar.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 5316 bytes
SHA-256: 432254150b25a86b939669ee89130fc2e7b5d41f8e693b7615241fb48b1ab4ef
font_01_sfnt_off00010ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA4 10424 bytes
SHA-256: c650be79758783218abca0f847d37006d35bb636a6c8ef318b997de5384d2365

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