Malicious PDF — malware analysis report

Static analysis result for SHA-256 15594ae43c37745c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 03:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d9fcff92368b3bcd40c8f1713cecb1b9 SHA-1: 19b7e63ccb97fdc31310e2e8b7c1726da5fa80e5 SHA-256: 15594ae43c37745c71f1aa971cf8ef5446018d8703f7d7eae1c3b3ea38460807
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://menokatea.com/ckfinder/userfiles/files/wupigefa.pdf In PDF document text
    • http://aan.kz/ckfinder/userfiles/files/vikeveragexomen.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/97262770464.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/rugad.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/fefabuzasebi.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/83614967162.pdfIn PDF document text
    • http://mcutech.net/files/28057139815.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/89474612965.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/11375849477.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/5d89b2e8937f8f7f5a710e73ff75f9b3/gefisanaja.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89605327618.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/10787384964.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7e10babc9cc2f516a09989bfe0966954/66833189491.pdfIn PDF document text
    • https://avflash.nl/upload/files/70357564674.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/37278737581.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-12/20210912165827640652.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/47202595436.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/wotivimewijuwexuxol.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/12487284233.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/23272053701.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/39394339305.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/92574248696.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/fesusebubugutezab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=all+fortnite+tier+100+skinsPDF 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_off0000d5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E4 10292 bytes
SHA-256: d870a6ee29fceb57e5dafa0c4ecf6fc2f008dbe53e531bad67be9ea757b8495f
font_01_sfnt_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10557 17312 bytes
SHA-256: f3348396a14acec7b5fd2ce03f3be7b5a80a9ce70ce991ec6f9fc68c74bf2190