Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c18b9b866a120c…

MALICIOUS

PDF

84.3 KB Created: 2021-09-19 20:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d250c1a931cf3e2b88118105ded11f20 SHA-1: b345b7aba21a06982bb29f1f26b18f18b835aad5 SHA-256: c5c18b9b866a120c52baec38a5241dabf80e0dd3a278741b97dd8fccd6a1d70a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample 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 potentially malicious domains, suggesting a phishing or malware distribution scheme. The PDF structure and the presence of external URIs, including one with a 'utm_term' parameter often used in tracking, further support this assessment.

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://novitas.ro/files/noselinanifogat.pdf In PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77881980156.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109031020171673.pdfIn PDF document text
    • http://vitrine-prof.com/files/fuzatekedez.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/muziremikatalejewosena.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/darikexidijomuzuvukone.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/lowesizewos.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/4785141364.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/81434548821.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/57850912518.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/50820090590.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/xuguk.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/roriguxexupu.pdfIn PDF document text
    • https://profm.hu/files/file/lizosure.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/gozikofefevizegu.pdfIn PDF document text
    • http://robedecreateur.com/img/files/99158700238.pdfIn PDF document text
    • http://coachhouse.info/assets/file/52390387423.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/23105686110.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/degexapanegiwusijonal.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/jubolunilutefunib.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/daiofnh7sg6c8ktvdna8krp121/33363622179.pdfIn PDF document text
    • https://10fci.org/userfiles/file/59199547369.pdfIn PDF document text
    • http://delve-cr.com/uploads/53628343512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mac+batch+convert+word+to+pdfPDF 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_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 10696 bytes
SHA-256: 18b9cce5b6319138a9c8ed2a22beb82a671a4da213f0b64f192992d3b69009a2
font_02_sfnt_off00010fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC1 19460 bytes
SHA-256: 04fb95ba65b7163ad7b0ed7840beda3c1162f9f133504042c602e64c30576f6d

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