Malicious PDF — malware analysis report

Static analysis result for SHA-256 35479a5602bf0b79…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 20:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d60da2e40e30b5a4f5e90431ad7afd23 SHA-1: 2315f29cce08ce84f34f114192eb27afe63a503b SHA-256: 35479a5602bf0b791fa310d787c9fa78a7dc164ae19d86d64b7349c51ebd8c16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and structured as a link farm, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://litho-and-co.fr/ckeditor/upload/files/guperavawuzonijotorefep.pdf In PDF document text
    • http://abwplazaview.com/uploads/files/wamot.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/libebim.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/lebanadojuvekebonaxomuf.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/56073056492.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7aa6e7bff---67474588651.pdfIn PDF document text
    • http://goref.ru/files/file/52072923815.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/37158482550.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/80219356382.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/rovuvafikeloluz.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/57610313396.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/86994686810.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/67196033598.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/vilup.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/87185349499.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/luzatijoxemex.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/vosipemesizoxolamegon.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202191123335040.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/41445977848.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/84451180950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=itunes+on+android+devicesPDF 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_off0000d9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D3 17820 bytes
SHA-256: 8bb61703d7eca32b2d1721c724e1b4bc49f8e76e97d77f94ea13430c6710aec7
font_01_sfnt_off00010886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 10432 bytes
SHA-256: 0f2870385edbf74e032e7f853071968072f1e40adb02a13ac839272d850549d7
font_02_sfnt_off00012060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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