Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef32c00c48c453d…

MALICIOUS

PDF

73.3 KB Created: 2021-09-09 07:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 954a80ae154044379b5ea3c2dbd921eb SHA-1: 42015a4e1ae7280d46d38fb6f0fc66a33d2415f1 SHA-256: aef32c00c48c453d282080c7780c9f387f9b200747f1d429be57eb7bd0a2fba5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, suggesting a link farm or content distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this being used for SEO manipulation or to host malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://volareinmongolfiera.it/userfiles/files/81719266636.pdf In PDF document text
    • https://pmeds.us/userfiles/file/bozaligorapewefuminanixa.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/jibufisowugilegomagisexuw.pdfIn PDF document text
    • http://asja.ua/userfiles/file/refevug.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/koloramipegujik.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/jopubuduwutofiwamun.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/nanukujifonutadejibi.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/jikawef.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32805490500.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/b2c05dec7f48d36240a672f3a0bf9eee/wifutuma.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/duvexapujudojo.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/didugovodakax.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///bovuriped.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210909_055150.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/27098576081.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/wopegujafunebixibusame.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/74303863336.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210901_F551EE726357D1B0.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/xitejebuziderem.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/42845011427.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/lufififumanumubom.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5e0243b0---puvewoduk.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/17416570103.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/giworobamejaludeved.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394fa4d2472---bareranososibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=brooklyn+99+gomoviesPDF 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_off0000bcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DE 10684 bytes
SHA-256: 3b8592e230650cb4f00b7315a96b855e58cfcce75b4a14b9d2b9a7230a92ba23
font_02_sfnt_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 16468 bytes
SHA-256: 3cbcfbbc541be6444a522ab7db3024e17cd1321a01a66c36196dcd1cea8b7f66