Malicious PDF — malware analysis report

Static analysis result for SHA-256 7262315e0e85ea87…

MALICIOUS

PDF

83.3 KB Created: 2021-09-14 08:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 290e0dc832f2efc16e4595052210511c SHA-1: d2b4d8a944433c0b00389dceb8f7a33624ecfd91 SHA-256: 7262315e0e85ea87e75c6982a4f7748c91d3167c605f2e60fa26c47d41266cc0
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 external URIs and is flagged as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://brukbet.com/user_images/file/23696892714.pdf In PDF document text
    • https://yukkumpulgroup2.com/contents/files/gilisalikekijorod.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/11931997349.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/7119415811.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/22109328376.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/27288036390.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/20679892033.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/nobafesukeponekibixijusi.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/97864925065.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dff6dec452---25086817633.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/31763153606.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/17765329559.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/vowenikoletalixarigux.pdfIn PDF document text
    • https://phukienbep.net/media/files/benevokuxuvigujetaf.pdfIn PDF document text
    • http://imagebuzz.net/ckfinder/userfiles/files/2521524825.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/20588186271.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16304680030969.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pisatirovesuzonami.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/zigedijekegebebokupel.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/32097609931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=copy+file+with+adbPDF link annotation
    • https://b2cdemo.tickets.com/content/files/50890634233.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210908/16310588852484.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_off0000df8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 10596 bytes
SHA-256: 93662adee3c7d07fa6fd4bcf05a09d2f1fd79556aeebfc2b338ed96ee3a7cb2c
font_02_sfnt_off00010fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCC 18160 bytes
SHA-256: 2be08a8464ef19c481266aaad0799618b25dc80df4e636386d0edbdddaafb8ef

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