Malicious PDF — malware analysis report

Static analysis result for SHA-256 de73e4b9f559b26d…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 07:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9667a6068e7eba39eeb87208da554867 SHA-1: f5c7d61fd1f596048b176558012257b25b047314 SHA-256: de73e4b9f559b26d7bcccc0683b561ee08d84ced45e03f5b872801ffd5345370
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or redirection scheme. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://niengrangchuyensau.com/upload/contentFile/file/naliporimakovupafevitir.pdf In PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/54690846023.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/58544465212.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/bch5aite2ol97np7719prqsam4/83612868704.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/duraf.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/fubapuxabotusanujuw.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/ravomatijosifaza.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/25719534654.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///jipenajitedumufuja.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-13/210913103736689812jtzem4frhei2.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/70110941568.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/91419155325.pdfIn PDF document text
    • http://abwrva.com/uploads/files/mibuzunobik.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/wibakezemen.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/27219551942.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/66480109643.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/74650935383.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/vilegoxonamesexag.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/56525944133.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/mevanogawozamijatiw.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/xiroxafifajemaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=yahoo+email+not+updating+on+androidPDF 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_off0000b1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C3 17728 bytes
SHA-256: 21d38db7845110ac8a094aec35d7959fe817b9d4991bd0084312b7f544cbdd05
font_01_sfnt_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 10752 bytes
SHA-256: e58e70634f32859cddd27f010243641b5e3592276c7bdff10073b89ff057113a
font_02_sfnt_off0000f7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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