Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ffee6df388b84eb…

MALICIOUS

PDF

85.5 KB Created: 2021-09-17 18:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cef81e10668af17bd56a36b9537e3803 SHA-1: 24d1a986ec6c11987d2c21100761ae7b1adb181a SHA-256: 3ffee6df388b84ebb706a368f83bf7898d0546c8e38c843514d83c836cd2a3df
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable domains, a common tactic for hosting malicious files or redirecting users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://citygclub.com/ckupload/files/87774027847.pdf
    • http://railwaysrailroads.com/upload_files/files/62640003689.pdf
    • https://oykufestivali.com/ckfinder/userfiles/files/99991600929.pdf
    • http://medicalproduct.hu/images/files/1525739916.pdf
    • http://worldplastsolution.com/ckfinder/userfiles/files/zubavurikaruf.pdf
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/dojebaligulib.pdf
    • https://open-call.fr/uploaded/files/tisulufemadupevisaz.pdf
    • http://blesk-stroy.ru/userfiles/files/daledosazenelivefozuxaf.pdf
    • http://amadpich.com/userfiles/file/salulitixubijuv.pdf
    • http://suurelepa.ee/data/file/danebuxuwita.pdf
    • http://vanguardhungary.hu/userfiles/file/95040862319.pdf
    • https://windfreeklima.com/upload/ckfinder/files/56651456638.pdf
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/51689791390.pdf
    • http://seoulsquare.com/userfiles/file/jebepivubo.pdf
    • http://ciba.lv/uploaded/file/41232399275.pdf
    • https://bakwanudang.com/contents/files/rigiwow.pdf
    • https://myclubowners.com/userfiles/files/lixejasijapo.pdf
    • https://abofahed.com/userfiles/file/nefolodexuxezobidew.pdf
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/42050259700.pdf
    • http://bilcafe.it/userfiles/file/3050438826.pdf
    • http://ceresasrl.it/userfiles/files/5045596378.pdf
    • https://virker-ikke.dk/files/63661356248.pdf
    • http://dissanna.com/temp/fckeditor/file/vibeliposujirajesulodolen.pdf
    • http://abwingsva.com/uploads/files/pozuf.pdf
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/toxemuretipugur.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=traffic+rider+download+in+pc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62b.bin
34a0ee4e87b9a6f10048df2e3e74a0f128d47eac18c21ebecf359c2e00a1b40d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 10396 bytes
font_01_sfnt_off0000fdcf.bin
43e340eacee5c1914c893e5d383825c7f54683510fe4626b3f96c8790710e3c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 19536 bytes
font_02_sfnt_off00012ffc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFC 16792 bytes

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