Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e4816338ecb926…

MALICIOUS

PDF

69.0 KB Created: 2021-09-30 12:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 64ba9c6bc148adcc24d76e45ecb06a03 SHA-1: a2c19bd6fdc300feb16b79cc007e7f91f6c14fa4 SHA-256: 38e4816338ecb92616842e85df5f300affceed2d8ab4d9213383f538e360beb7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. This behavior, combined with ML and ClamAV detections, strongly suggests a phishing or malware distribution attempt. The file's structure and the presence of multiple external links indicate it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://morebricks.com/ckfinder/userfiles/files/62695612400.pdf In PDF document text
    • http://circolonauticofavignana.it/userfiles/files/67267140704.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210930160700.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/71054081730.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55525509404.pdfIn PDF document text
    • http://tencanpowder.com/d/files/giwus.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/19839942977.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/wejep.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/birojemok.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/61894892731.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146f2ceef354---52436563885.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/86704526249.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/tasupivodute.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/21803137304.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/wegiverimolipum.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/17116326043.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/sabokugabufom.pdfIn PDF document text
    • http://suurelepa.ee/data/file/goruxuzekewovujo.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8e85cb252---29505188760.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/kinadozerodefudaveguxew.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/nigil.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/74012616222.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/14729378475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+make+a+playlist+on+my+android+phonePDF 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_off0000b0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A0 14584 bytes
SHA-256: 81c1abe79f50d7674453408434ad3be045789b4b1fded5fe44e8a382e68300e2
font_01_sfnt_off0000d511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD511 10940 bytes
SHA-256: 9817667a52c9d5712e389ad37c06ab937099ea7464e1349000df992c549932c6
font_02_sfnt_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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