Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a2ad37f05daecb…

MALICIOUS

PDF

77.1 KB Created: 2021-10-06 12:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 12cd8835c07720d1efa02b38fa273509 SHA-1: 90d08e1543a23b883c7104f44adb4c5d6a56c815 SHA-256: d7a2ad37f05daecb77084ef4690ca633ce1cd3725c98bc950a436f134ba82a5d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs point to various PDF files hosted on potentially untrusted domains, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://1mosref.ru/ckfinder/userfiles/files/32601104953.pdf In PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b77793a277---8818602160.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/lavoluweropekamaki.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/8283676534.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/18270645645.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/zikunires.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/28888408904.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/vilexazebufeped.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/derabutarosup.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/87562804932.pdfIn PDF document text
    • http://hangquangauto.com/files/32540083427.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/kometeforelo.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/69484955832.pdfIn PDF document text
    • https://limadelimon.com/images/file/95702287263.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/64682217140.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/75400282043.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/kezabafojonajujutarimopas.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/gupoxitadad.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/69645361696.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/garovugozigej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=one+night+townPDF 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_off0000c96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96D 10020 bytes
SHA-256: 5cfde1b6bca0d55892f1ae93bfcd4098dd4e5d4228eee1536860f8d5ecfee274
font_01_sfnt_off0000dfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA9 18576 bytes
SHA-256: 517466830e9a73e1b5cf9df5f23fb7a705269d19543a144ffff3aba6736b0a53
font_02_sfnt_off00010fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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