Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca59049ae43b2e1…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 21:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ced18beeffd0a6780758171b91dfa1fc SHA-1: 5a7cc093981e97d065b2b692b46ca32897625d14 SHA-256: cca59049ae43b2e1a17a7c97b3c2c15d41ce88f4d4d490e7683462dd165eaf67
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with a critical heuristic firing for PDF_JS indicating embedded JavaScript. The PDF also contains a large number of external URIs, many of which point to potentially disposable domains, suggesting a link farm or phishing attempt. The embedded JavaScript likely facilitates the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vizugy.hu/uploads/files/files/9409374850.pdf In PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/99157996732.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92375650837.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/12096249903.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/71777265619.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/84414480460.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137da3da41ee---56573304786.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/97957142207.pdfIn PDF document text
    • http://imi.vc/upload/files/sokaxomopinejowarujitil.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/zajinegavawowetunanel.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/45510018702.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/bezixagesiponedek.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/sajulunavogukewomi.pdfIn PDF document text
    • http://taxfreepoint.com/file/75862373731.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/toporipixi.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/59363939604.pdfIn PDF document text
    • http://chpcentre.com/files/file/livamubotuwete.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/65288826750.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/36912010448.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/87423392346.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d842b4c953cc7e180a17cb14238009f0/pexegaba.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/sutudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=photo+background+change+karne+wala+appPDF 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_off0000e023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 10952 bytes
SHA-256: e5fc15063848e63729cef11c55cfb15dd718dced6f25e608bbeffe3ba7631912
font_01_sfnt_off0000f92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92C 17668 bytes
SHA-256: a614aabaff9f54c741a7d3623064a3cab485b25855d2bbc3b91e634df6e22bab
font_02_sfnt_off0001265d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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