Malicious PDF — malware analysis report

Static analysis result for SHA-256 5281ed4a23e71545…

MALICIOUS

PDF

77.9 KB Created: 2021-09-20 21:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bcd4956b63689db7af3d4041533b1a74 SHA-1: dc936f22fd5fcdc73ed8191a3598f18556c18799 SHA-256: 5281ed4a23e7154523980d2435265b213e676ba3e056de28a7b16d9a30a907bc
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, 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 phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bwhe.in/ckfinder/userfiles/files/41732297768.pdf In PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/08bj3j4652d4875tkn2d3pkptr/domisaj.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/50648364172.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/60719765190.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1631966545450207080.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/wosufowegolubazinudinir.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/xalitatikemexevuto.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/31994831910.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/nijukafesepux.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/gufosejererome.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/30880038833.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/39494714724.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/5a60754e28a75add401fcf4232faf7a0/5273212270.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/56414575155.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/362688348.pdfIn PDF document text
    • http://boldogelet.hu/media/90799096814.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/zafaf.pdfIn PDF document text
    • http://falerisztika.hu/tmp/30646990415.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/vegenobajabu.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/nelenugelej.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/nedetubax.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/84070974656.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/84491669757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+open+mobile+if+we+forgot+patternPDF 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_off0000cd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD39 17032 bytes
SHA-256: 52ae314bbccaae6786986fa5181e75a90a44a9e1d9807c5e617ee5c95e982f3f
font_01_sfnt_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 10748 bytes
SHA-256: 5f46f09a82e1df121421906b69ee7fbeaed34837254310dbb2502ed21e445f49

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