Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bd54b5e355de2e…

MALICIOUS

PDF

82.9 KB Created: 2021-09-10 00:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 22819f086595648fb4a304600192a68d SHA-1: f53038cb2a70771425179ddb31f41c59258a2381 SHA-256: 64bd54b5e355de2e6654a93bf387f7831157ee8d9fe22bd4c242e87c0764f151
186 Risk Score

Malware Insights

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

The PDF contains multiple external links, including one to an algorithmically-generated URL and another with a UTM parameter suggesting a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, further supporting a malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://irlanc.ru/uplcv?utm_term=install+itunes+on+chromebook PDF link annotation
    • http://showpalmedical.com/userfiles/95599032822.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/vejamogifofogajanapif.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40538863475.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/munoriwuxewe.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/soxegakineb.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/71283041823.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/tetanubimanunuzurukuse.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a76ef616e9---mipaso.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/60333577545.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210901161131.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/xedotif.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/penogotuwudobipek.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/bikiruwaxirutima.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/17970048658.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef9ee6763---78090885632.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/15538800505.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/laxevaferafaramigumetu.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/97171922002.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/fazuzuf.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/tosiriwitajewosok.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/wokiset.pdfIn PDF document text
    • http://rapet.hu/files/4995552858.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/81574923739.pdfIn PDF document text
    • 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_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 10780 bytes
SHA-256: fbfb467444c96881c4c1d5ad23853c55caf0ac3f98ffb7d3d778277ba93fbc4b
font_02_sfnt_off00010f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F47 18188 bytes
SHA-256: c66e825acdf4a63b67225c6f8af99c6a99ea561154b79098ced6c1f68dfb54c6

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