Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd801b6cbebf762…

MALICIOUS

PDF

84.9 KB Created: 2021-09-10 04:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bbe6a089246ebf04fda6d595618fc83f SHA-1: 95425744d88d84cccca42b149a5ed8d5da772957 SHA-256: acd801b6cbebf762446a3259fe0a738f76d6ee3a68a5cbdb425f3a20ccff723f
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/14810113677.pdf In PDF document text
    • http://519pf.com/userfiles/files/38344084394.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/lidevefukamu.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/vekomupedovitoworalewurug.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/17338765601.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/99888695147.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/84289448451.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/22307696235.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/rawilabenoverisodipapul.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134970441028---93801430303.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/kinijokanuwimedikakaxe.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/rufuwokemunakepef.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/50776573449.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/wotufir.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/9544332118.pdfIn PDF document text
    • https://equimat-cheval.fr/file/31189504651.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/gelumolugatu.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/39238052515.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/bugamuzebesigiwowiwa.pdfIn PDF document text
    • http://espokebar.com/uploads/files/24883312870.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/femupomutegorun.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/24023422841.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109011514204160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=objects+that+start+with+vPDF 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_off0000e18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 10504 bytes
SHA-256: e0606df9f63177f58b7566390533ea53161aefaaf56a63da7cad3bb91a99f1d2
font_01_sfnt_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 20232 bytes
SHA-256: 93512442c9885400bff5577ed975ada38f01b7f43d0795305bf91d6003e0dbe0
font_02_sfnt_off00012e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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