Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d511e63080372f9…

MALICIOUS

PDF

87.4 KB Created: 2021-09-08 15:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a79552e9d0267bf4758e040fe63929f0 SHA-1: 9945f95a2f306681b0fe2c56fb07641bf4036f1d SHA-256: 1d511e63080372f9819c60458f179f039dc470a94ebfe46524f4a5ac83fe6b36
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on diverse domains, indicating a link farm or redirection strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL distribution align with techniques used to obscure malicious content and evade initial detection.

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://pro-customer.de/userfiles/file/rinifudapav.pdf In PDF document text
    • http://logicamail.it/draft/media/wulew.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/bitugutaj.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/20670813919.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/89079257593.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/83660888459.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/fikitiwefole.pdfIn PDF document text
    • https://teamcode.net/upload/files/vijubitobu.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/1360943111.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/xaridodebamerake.pdfIn PDF document text
    • http://sinners-party.de/media/file/ronakisarobuv.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/xisuwopuj.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/31099606481.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/buxofojij.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/42507591462.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/woperepagonejadijore.pdfIn PDF document text
    • http://zenkatsu.dk/files/pimogedigutosefirajajas.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613586d49241b---fijemudefe.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/72673156689.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/donasugobetuw.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/39659212006.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210906_B7C4B06376E1D84D.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/57335489625.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/67720941558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=structure+activity+relationship+of+aspirin+pdfPDF 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_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 11072 bytes
SHA-256: 9f4799e23e09ac9c894ab71784f9ace58f6f596f79f7df6639812a0f560c9035
font_02_sfnt_off00011e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E80 18736 bytes
SHA-256: ebe5d6b807c905636d308852d7f7519b2397ee36808be0ff6ad26c7d3471b4d7