Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33e9bead0529408…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 12:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 91059e286b8d6b6a44863fe05fc6f161 SHA-1: 1623203e192e75d69c30328cc300927e0143525d SHA-256: a33e9bead0529408ddbad3928c507d2de4c4591a64f11da92ef7c6941ee3cce8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable domains. The embedded URLs point to various PDF files on different domains, suggesting a coordinated effort to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://exosportsante.fr/ckfinder/userfiles/files/82050289327.pdf In PDF document text
    • http://nbmounts.com/userfiles/file/1631083650.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/24074284131.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/50575941852.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/61272218310.pdfIn PDF document text
    • http://net-work.cz/data/file/68669566291.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/roneneg.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/xegagapapexelizada.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/50783145697.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/89655478207.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/mozajupavesi.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/12031185927.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/91188624175.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/suwuloluvibadofus.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/najitaf.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/xozomuviwiwisomawulos.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/99341435974.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/96366699837.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/58274506553.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/69333268656.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6172455665.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/lililepe.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161364a3e3c65a---zozapipezagibagon.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/68183249003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=best+10+android+gamesPDF 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_off0000dd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD38 10772 bytes
SHA-256: ba23c7b533e4aab769c94c76667de6d6def06e768ead12622fcdd081965550ff
font_01_sfnt_off0000f5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DC 17640 bytes
SHA-256: 6fd05fea9fd86412186ca07457e6d41fd010652c0cb31e3eb51faef87b8de2a0
font_02_sfnt_off000123c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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