Malicious PDF — malware analysis report

Static analysis result for SHA-256 9845cd2d06daf09d…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 04:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 941a1c8015c036cb56b25e68080bdcc2 SHA-1: c178243c7d2d3d778325768d99d2b50691c2a5ea SHA-256: 9845cd2d06daf09d8db3ecffa0090878c289c98e5d34caa732d4e9b020a473fb
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for distributing malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://gosselindesign.com/images/from_fckeditor/fichiers/dumina.pdf
    • https://ubranni.com/uploader/files/43750030374.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5cdb58a7---67775728388.pdf
    • http://pastoret.it/userfiles/files/1233092664.pdf
    • https://yp05.com/_UploadFile/Images/file/mizixonutofedalufib.pdf
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/sesefakamafaxerip.pdf
    • http://ablerexthailand.com/userfiles/files/28881956935.pdf
    • http://eternalcycle.com/FCKFiles/file/42936223414.pdf
    • https://puntodeplacer.com/userfiles/file/57094729164.pdf
    • http://cissi.it/userfiles/files/9428584941.pdf
    • http://islenapuntos.com/campannas/file/83563995689.pdf
    • https://dansobentre.net/uploads/file/22466922491.pdf
    • https://istanajpdua.com/contents/files/19739511024.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457e2912e4d---80726157391.pdf
    • https://chaletsuenodesol.de/files/suvotagoval.pdf
    • https://toolsatool.com/userfiles/files/21272327384.pdf
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/betolasonar.pdf
    • https://valubil.com/public/uploads/cms_file/cms_files/dagikamapudojizuwet.pdf
    • http://hyunsin.net/userfiles/file/jimuvovitusafepitelerax.pdf
    • https://y3stwk65l-mn9.com/contents/files/92517492432.pdf
    • http://cheliabinsk.realxenon.ru/uploads/files/fagutoturiterelinekupapo.pdf
    • http://hb1004.com/userData/board/file/mobabexaw.pdf
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/figubudo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=regex+for+password+validation+in+java
    • 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_off0000b220.bin
729ad7f0ec82ad665a98ccbe6425dc5d4615b267a056481ecd302c6de8f76b9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB220 16228 bytes
font_01_sfnt_off0000db63.bin
d8f66cb5c260eccf7a24fad9713f0766b5d5c34a06158da3924311f7405a3211		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 11104 bytes
font_02_sfnt_off0000f537.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 16792 bytes

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