Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c546c75fb770257…

MALICIOUS

PDF

69.3 KB Created: 2021-09-20 14:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 944f0cfc1aaf81bd85ac26352b60bdd2 SHA-1: 7231067fdcf179cd0f6cf47590a20096fc7c5294 SHA-256: 0c546c75fb77025778c4f7bc279ca1f309c8352485aa2cc6093896a9d5f3d52e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16147f54645654---45969577744.pdf
    • http://suamanhinhlcd.net/userfiles/file/967412157.pdf
    • http://audidalys.lt/ckfinder/userfiles/files/ravijatu.pdf
    • http://xn--e42bt3l.net/upfile/files/36403243017.pdf
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/fefibojelamufuvatu.pdf
    • http://bamor.org/userfiles/file/47281284775.pdf
    • https://gamaconsultores.cl/upload/file/26083382007.pdf
    • http://metalzilembo.it/userfiles/files/fujazim.pdf
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/28240666893.pdf
    • http://zge-led.com/luodan/images/userfiles/file/zisumuxebadawav.pdf
    • http://poketomecam.com/uploads/files/xosonobaj.pdf
    • http://yeosingol.com/FileData/ckfinder/files/20210903_9EED9013612B79F1.pdf
    • http://craftland.de/res/wysiwyg/file/36960066776.pdf
    • https://ylwlgwadmin.ylwl.cn/upload/files/74975424702.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9c9820f4f---1331586305.pdf
    • http://mbjarrahi.com/UploadedFiles/New/file/loputodareriwupagetakub.pdf
    • http://carsonpokebar.com/uploads/files/bewakozibipalejimid.pdf
    • https://cristalparkhotel.com/ckfinder/userfiles/files/leronibusidej.pdf
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/zafujus.pdf
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/ledinojuxijowojufatafamin.pdf
    • https://www.terraton.com.my/ckfinder/userfiles/files/ligasa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=push+notification+in+android+using+firebase
    • 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_off0000af33.bin
0a5571fb4255f1b307b59491fcb336e154226244ffe14665bd3baba3c32c5bf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF33 15544 bytes
font_01_sfnt_off0000d641.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD641 16792 bytes
font_02_sfnt_off0000ee58.bin
ce6e24604fa04e0ab9b5d463c9f94eec37f0c8bff8598411c6c7ab291ede3955		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE58 10952 bytes

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