Malicious PDF — malware analysis report

Static analysis result for SHA-256 63af984ac440a7ad…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 05:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ea8b146c8291554224bc89cd9433c1c SHA-1: eb539ba9b62fdc57929a476a1dfa00fd82a015d4 SHA-256: 63af984ac440a7ad84c78adad6257d4a3eb7ac32caba254bacf28dd149c8a751
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and the presence of numerous unknown URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://thefertilizerproductionline.com/d/files/xenikasuwemibobadofexuv.pdf In PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/lezafawijexuxed.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/69063410114.pdfIn PDF document text
    • https://shunnasato.com/wawazudokalusodu.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/9933598067.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/xaretakirirejidapatera.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/4788296338.pdfIn PDF document text
    • http://dejede.com/userfiles/file/80535914910.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/nunononivikukad.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/38238761017.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/xurukudonudewopilot.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/puxudajeposiguzel.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a60824f7d22229e3916edbbfc711ff4b/roxabosepipirelaf.pdfIn PDF document text
    • https://protrialse.eu/files/files/wurovovozakifobezi.pdfIn PDF document text
    • http://teifsepahan.com/files/file/musinopadipugijupa.pdfIn PDF document text
    • http://ned.ru/uploads/files/64425218265.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ec31ca501---dudijogotoruwixusa.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/98833619756.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/jokojatadugibitizim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=analytical+geometry+formulas+pdfPDF 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_off0000d145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD145 11160 bytes
SHA-256: 9d99da0accbc1ad042133bb313bd1608f497e5b291a7389da8352501aded6c25
font_01_sfnt_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 19952 bytes
SHA-256: a94d5798f37793b7b0c4614ceeec98a34fa900191e81c38c0dd6160dad62d560
font_02_sfnt_off00011f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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