Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b4cab1f389a57e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 16:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 08604bafa7fd808e54b8b80fb2b12b62 SHA-1: dc07e3d1ceff5329ac4e3294d364463bb43dea71 SHA-256: 34b4cab1f389a57e350e7ff3ea559e08ce36700d95ecdc7774ad1a9fb9419c8f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to PDF files hosted on various domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, commonly seen in phishing or malware distribution campaigns. No scripts were extracted, but the presence of multiple external URIs points to a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ibericadearmerias.com/file/toseve.pdf In PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/46998408596.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149b437b0fdf---97455476963.pdfIn PDF document text
    • http://mfcpavpos.ru/file/vamizetaw.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/mametas.pdfIn PDF document text
    • http://ahknchem.com/upload/files/89063935658.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/10997340707.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/771849059.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/76710080747.pdfIn PDF document text
    • http://zzquansu.cn/d/files/34428343560.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/sivuretusuniv.pdfIn PDF document text
    • http://szcftz.com/upload/20759309756.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94974331458.pdfIn PDF document text
    • https://demoliman-host168-com.twbiz.me/data/html_editor/files/67011832549.pdfIn PDF document text
    • http://friulanapanini.com/images/file/sarig.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/40247003526.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/62791809019.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/regamukejirowibeza.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/pobekilujigufus.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/borafupujeludeposozezega.pdfIn PDF document text
    • http://kme-kme.cz/files/file/41833982212.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/18575347114.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/fijapekesobuteni.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/18463110671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=impossible+quiz+23PDF 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_off0000b0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C9 16912 bytes
SHA-256: f1454ee2f9c8e7084cbc28d1e197d99f4e21f4a3159073d30fbc2982bb8e4af2
font_01_sfnt_off0000dba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BA 10640 bytes
SHA-256: 11939a849aeb19701f556eb33521d48cc6da2b8a92be745f45007c3203ba8cef

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