Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b44f771af9a11e…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 01:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ec95389eb7218b2c7a30d810609e390d SHA-1: f6090b174c09cdc2a3c9ef4c9f2d6daa81981b5e SHA-256: e8b44f771af9a11ea23e6794e1e753335ffa52d3d35bf09ea21d99cc428d9e1c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF sample was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the document acting as a link farm, directing users to numerous distinct and potentially disposable domains. While no scripts were extracted, the embedded URLs and link farm nature suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://sql110.com/pic/31439136148.pdf In PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210906084339.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/77377303869.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/dobarupimidi.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/ronukal.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/50756352712.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/nuwenevu.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/nemetogibafimeped.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/81156320453.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/zotunobazuma.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/91b6e5284c3834d5dcf898892c99e485/70293103784.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/gulemo.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210917064848.pdfIn PDF document text
    • http://prograsifkalip.com/files/nekupela.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf5006bcac---xanemivoxa.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/48540433726.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/zitixiw.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/joginamodokonodolur.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/2174156097.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/73893645665.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/napol.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/40187238266.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/vabugaginafuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pretty+when+you+cryPDF 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_off0000c920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC920 18692 bytes
SHA-256: 572f47eed37cfd4736dac349610cd41d4c084e6a90e29e425e782632c6f83c7b
font_01_sfnt_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001124c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124C 10160 bytes
SHA-256: 3b733379a0d05b4be6dc8219a11885a2678ee63eee256762e900d864ee7ded29

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