Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e4ae05cf6fa7cb…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 11:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f25ba5b5a317bd704fc78990e6d4e23c SHA-1: 4ba424a87f2bb12da571da23a28b222fa9870555 SHA-256: 11e4ae05cf6fa7cb8176f52acd97a7fcdc0e3f7c6bff2d24f48c48c521c0555b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host multiple links on disposable domains, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful 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 http://chiari-web.com/ckfinder/optimist/files/visuxuje.pdf In PDF document text
    • http://splhardware.com/UploadFile/file/2021090909210373499.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/77649907122.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/7347848235.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/23210225718.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/5849483161.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/77170cecf02a8351dd265a7eb1394b2b/fumunomipebegalovidebo.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/64152515928.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/17162900247.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/38910697081.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/giwirepozavitoripotuk.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xatuxetiga.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fbed7d6a0---nepabelarovezud.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109030251568229.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/lisosel.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/14978172046.pdfIn PDF document text
    • https://phnews.ro/files/file/98605386529.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71055470033.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210907170451491.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/28144157238.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/99529010309.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/pitudirefokorajudi.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/mumolanutavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+transfer+contacts+from+one+mobile+to+another+mobilePDF 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_off0000dab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 18304 bytes
SHA-256: e31f0eac6e456586f7df8894faff2b5f1e347596b88b4d8b3f6883503d134c17
font_01_sfnt_off0001091e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12135 10820 bytes
SHA-256: 10fbb06e7d22693e1d8a3cd64c67cd024bf013596f4f82654073468f165c6778