Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5bfe6a9fa60c10…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 11:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f615e4daf872e864782af24d10cc6898 SHA-1: 1242c45a8c66eeff34135a173178bd03b66f6d82 SHA-256: 9b5bfe6a9fa60c10204912a795c0509c8d85f5365dbe27a7770d0c2398400eb9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with disposable hosting and a deceptive download button, suggesting a phishing or social engineering attack. The embedded URLs point to various PDF files, likely serving as lures or further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://seosanhrd.com/userfiles/file/57526058238.pdf In PDF document text
    • http://elosc.com/upFile/file///ITX202109080206254525.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/58381826767.pdfIn PDF document text
    • http://drtamerturan.com/file/rivunejafen.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/38637049526.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/xonanoniwagil.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/1297857929.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/ruvososamim.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/pinono.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/16984214689.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0dea494ebf0ed338f397194d6f682692/kapinipozebuxomob.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/76773178679.pdfIn PDF document text
    • http://pk.mo/userfiles/file/62179741381.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/telafugunono.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/26615722669.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16140021809d6c---39852296648.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/89884202356.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/87204057552.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/10182099586137fb68d0a94.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/55185705773.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/80705491232.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/borekemapal.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/linunut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=aplicativos+android+iphonePDF 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_off0000daf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 18644 bytes
SHA-256: 83fb9a2c25a624ee70e5e9ba5441cbfa1a3ee10a403db60b4de8d01c25535176
font_01_sfnt_off00010b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001234d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234D 10656 bytes
SHA-256: 6c10fa09ad5e59e663e6a9ab8d965a5dc3116d4fccdb613375d54cf65390dfb9

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