Malicious PDF — malware analysis report

Static analysis result for SHA-256 f941cd6095eb7cd2…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 13:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3af64a3d5bb18d219aa49fa08f7f0e53 SHA-1: 7f989b783f865843f0b4df80ead4dbf378b369b7 SHA-256: f941cd6095eb7cd2bb4a0b56b8afab9d1bf2fecf75a8f88f621689b047d19c94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, which is characteristic of link farms used to obscure malicious destinations. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using numerous links on potentially untrusted hosting. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests an intent to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://omonetach.pl/foto/ilustracje/file/42743839181.pdf In PDF document text
    • http://maulich.vn/attachment/files/36208729592.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/fitekadupolijij.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/nazeserokike.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/vuziniximimonof.pdfIn PDF document text
    • http://msiutilities.biz/documents/zisofajonukituxu.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/tefewu.pdfIn PDF document text
    • https://j26clean.com/upload/files/48142794308.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/36774762191.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/i9mqm765nrovacac8709fsdpm3/80653404766.pdfIn PDF document text
    • http://master-vin.ru/files/file/petoku.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/63660887674.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210910_C69CCFBD44A46C18.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/49783638677.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/89521271811.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/64337718911.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/turef.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/98394256984.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/dabaxodivuwofume.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/2588262267.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/90122033877.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/54598089542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=google+drive+for+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_off0000d5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A1 18556 bytes
SHA-256: 6895870eb0fda5ecba2d83c8000484aca51ae73908757c741bda1fc89a161866
font_01_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 10368 bytes
SHA-256: 7fb4452d070f335e3c53140ef108816137cfaa892f652b894c6435fccad69db8
font_02_sfnt_off00011caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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