Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1d3043d020b97c…

MALICIOUS

PDF

68.2 KB Created: 2021-10-01 02:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 02105eaa54cc196cd32884f0c75dda7a SHA-1: 098eee0269b332a65453fde0b88e61527be50fc0 SHA-256: 7b1d3043d020b97c510521cc3d276d49464f99e3eff6c0c062287262e5e0f6c4
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, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the PDF's primary purpose is to redirect users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://dalnoboy.net/data/filestorage/upload/files/nofug.pdf In PDF document text
    • http://abwmountvernon.com/uploads/files/41235129240.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/masagemesed.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/tepokapowodu.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/26884482093.pdfIn PDF document text
    • https://finliz.lt/i/File/xibazavuzivivemifojedibu.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/32867063192.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/gikapanumu.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/19639611725.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/xelabifebijuku.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/vikepujinurujoxopukefaw.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/57366118106.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/gizivemetetozuvekex.pdfIn PDF document text
    • https://davaocarrental.com/images/file/14650503517.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/kifafavenotaxosik.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210920194449_bmzl14.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ee1d867e3f3d5ac760f36afc64e91a4d/pezapafukuwonijezaziro.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/18674122550.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/3604414773.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/k69m3q2o0lbkfejehqclvlj3im/kanatevefefagigato.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/bekaxifirovuzixuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=counter+attack+mod+apkPDF 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_off0000ab42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB42 10592 bytes
SHA-256: 54ffb28dacd56ed79839471c5529f3c508923cb0ebef79f98f0a6b3e48f8c3df
font_01_sfnt_off0000c37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37C 16124 bytes
SHA-256: 30ff985067a6d9d6d07bc748c0ee4ec53745e0cc73c74f4b61b5f1a51ee832c8
font_02_sfnt_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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