Malicious PDF — malware analysis report

Static analysis result for SHA-256 a369806852fb3dd5…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 09:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d945aa7d55cd9533fb595b67f73b018b SHA-1: a1a5dc61c84e08609ddcc746553ff843e30bf1aa SHA-256: a369806852fb3dd5364b8fb945d02f5f93e77c7e28108b9bd8d7720556a64377
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs pointing to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://drafthe.ru/uplcv?utm_term=world+war+2+heroes+game
    • https://axlthailand.com/imagexx/files/runukidexogonuvarobujegop.pdf
    • https://kompaspt1.com/contents/files/zijinifedubanin.pdf
    • https://equalland.com/uploads/File/pakesoturitileporupi.pdf
    • https://spandoekland.nl/userfiles/file/lokugadidinunaba.pdf
    • http://gusanhightec.com/userData/board/file/dofukof.pdf
    • http://poketomecam.com/uploads/files/90375078726.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161446e681f2e9---fosufedevevedobodipe.pdf
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/bovuzaxamak.pdf
    • https://triangle-electronics.com/assets/userfiles/file/27804239949.pdf
    • http://polenes.cl/userfiles/file/64322517247.pdf
    • http://learnazia.com/fck/imagesfile/49993901263.pdf
    • http://140.121.180.103/ckfinder/userfiles/files/wofurevavomefevero.pdf
    • http://alanaf.ru/userfiles/files/nunezi.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/70203824084.pdf
    • http://leoclubmarsala.it/userfiles/files/90303627149.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8f213ed3b---57318415503.pdf
    • http://cisseo.net/userfiles/files/sedemekesideburo.pdf
    • https://toppelletmachine.com/d/files/natonotif.pdf
    • https://tl-systems.hu/files/files/51301006336.pdf
    • http://mcap.cz/images/uploadedimages/file/rekerisuminid.pdf
    • http://splhardware.com/UploadFile/file/2021091109082473499.pdf
    • https://sbmhavacilik.com/userfiles/file/14381646876.pdf
    • https://berbagiangka.com/contents/files/20630987822.pdf
    • http://holidayservicemarsala.it/userfiles/files/lolinisawotezabo.pdf
    • http://meetburgerusa.com/uploads/files/dezodovaditelezisu.pdf
    • http://mondoacquapiscine.com/userfiles/files/fopozolejenokatonurisede.pdf
    • 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_off0000b497.bin
f24c775dea37f477ec7eb4d66c46de161c2998721c24233ed2691a9a4bd46e6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB497 10600 bytes
font_01_sfnt_off0000ccb4.bin
9702ce70ab3c1394702d99345341de582b47af49f9adea5e486e6885d846bc00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB4 15156 bytes
font_02_sfnt_off0000f355.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 16792 bytes

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