Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e108bb729dee77…

MALICIOUS

PDF

72.3 KB Created: 2021-09-09 16:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eb249d54fdd31e295ca3764797799dde SHA-1: dd50afe08c09ed5f0bb795f0a1fdcfe855355e30 SHA-256: 97e108bb729dee7792340b3597e036d5971b0b0c666d6209f01f81f1c63bca51
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The presence of these elements suggests a phishing or malware distribution scheme, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.yemany.com/yemfiles/files/97320412800.pdf In PDF document text
    • http://ccswcd.com/userfiles/file/jotopexijajogonogegedux.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb2a7ecd49---jiwaj.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/winosumawefizajizejeziw.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/medikuzikenanuzef.pdfIn PDF document text
    • https://andana.us/files/files/fejosetexosagawobodid.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/13033253806.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/sikaxokewunamarufoxide.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/99808832119.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/runagutaxavulesafazes.pdfIn PDF document text
    • http://cambodiaangkorhomestay.com/userfiles/file/856384498.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/59292691087.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/mufarilupobo.pdfIn PDF document text
    • http://domosplast.hu/files/file/83350472484.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/bufawijotasu.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/38863247843.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/sojelif.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/de89ce4526e964f6c2a7b79f7846b0b8/zurobegakexewitizixowi.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/somegolukinibo.pdfIn PDF document text
    • https://gangnampools.com/contents/files/96782823492.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/21801809923.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/11631912581.pdfIn PDF document text
    • http://24cvety.ru/upload/files/55228585976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=banking+app+android+studioPDF 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_off0000b944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB944 10632 bytes
SHA-256: 78da908764ae69f7d60f824c5dcdb1519ebb3d0f4de0bc4fcf20fcad0f51abbc
font_01_sfnt_off0000d187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD187 16212 bytes
SHA-256: d0d17c410ab9c04ebd31ce017b2b94cc74f29e5db6ddf83fb45ac3205fcb6866
font_02_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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