Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ebbf81ae8df76bc…

MALICIOUS

PDF

83.1 KB Created: 2021-10-29 10:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a8ea77fcecd1203222c391ac8593a88f SHA-1: 73aad6ed70339f5859dbb3ba78297952a7b806a1 SHA-256: 9ebbf81ae8df76bce7e1f862a95147c323c3d5b642d14b2f4abe508a4c185096
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://istanbulbalbir.com/upload/ckfinder/files/meraluzigurokepegojozux.pdf In PDF document text
    • https://krygina40.ru/UserFiles/File/zexumim.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/feraximor.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/nokobifefovesuwemuseti.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20211015043219.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/xivebadiwifamiseruwazo.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/wetelupuv.pdfIn PDF document text
    • http://thecuriosityshot.com/10983370515.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/57738251680.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/59562819046.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/10669756583.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/kimoweram.pdfIn PDF document text
    • http://186086.com/upload/files/mirojofokanorizazivejo.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/50972557087.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ojb3um77onhhf6p9j5ndcastsv/melisomojo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/hdgjtgduk56j08k46t7lvdiu00/zorokez.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/wesemafufitaze.pdfIn PDF document text
    • https://asp2.aiwangyun.com/ckfinder/userfiles/files/patefufogizaxox.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/11157699015.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/bazasadiwi.pdfIn PDF document text
    • https://melz-feu.ru/upload/42597290214.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/nepebokuripozan.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/15420797690.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TxADE9PCSUw/uplcv?utm_term=heart+pounding+in+chestPDF 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_off0000e101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 17412 bytes
SHA-256: a6a6ae44c43041a0712ec2d69856c7e4b4522ad4c59c4869ed221c79b851cde7
font_01_sfnt_off00010da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA9 10836 bytes
SHA-256: 7c5e19e22843f71cc16bb8881746c7ed2777bfebec7945bf1a6e89f44a58bb02
font_02_sfnt_off00012654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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