Malicious PDF — malware analysis report

Static analysis result for SHA-256 7433a4a78eab516e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-18 10:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ea664790dc1c9e91f153c3c7a44aaae SHA-1: fcba9f148e0472df6c42ea0338be8d141a3a059c SHA-256: 7433a4a78eab516ef17c58139743c5a589467c60dd7246ce911f7df0ec01ecbc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, consistent with a spearphishing attachment. The PDF structure itself appears to be a link farm, further supporting a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://allytemp.ru/uplcv?utm_term=survival+house+minecraft+ideas PDF link annotation
    • http://k1a.ru/images/files/file/xuwivosexawulanesi.pdfIn PDF document text
    • https://rcot.org/userfiles/file/gidukanozulu.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/7931111583.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/vivonisapumifiwo.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/75489108600.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/26150564592.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/litolofag.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/79050301105.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/xibolalanu.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/ximofujivejeledug.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/34370892722.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/tovemelizevigolijesedu.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/93265860209.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/xuwafobobubawepubivaj.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/83401422340.pdfIn PDF document text
    • http://zgic.ru/!upload/files/569293862.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6bf493d188541ad08cc8518b77103789/tetatoduvekubekozi.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/3667795797.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/nakituwenekulenesabo.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/basitozedavezupi.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/76096668767.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/e1d2o5uq66pvbvd8sev7di0gbd/25316978656.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/fusozojozukun.pdfIn PDF document text
    • http://allycatering.com/userfiles/68772352584.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/kexovipamokowamuba.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_off0000b5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF5 10980 bytes
SHA-256: 5c33063b59a4962baa130433fbf1da281348e0088de8e8122e649eee940caf1a
font_02_sfnt_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 15472 bytes
SHA-256: a47b6529309ab13f9c8f9047bc2e6d79dca3c9ab23d05863876b818d94c3f9e6