Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1317ad77310f1cc…

MALICIOUS

PDF

71.4 KB Created: 2021-09-24 20:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6b8455e616b7d996050dae855c1c821 SHA-1: c9ae3dbcd69a347375310095c1e33b9ad2d46c80 SHA-256: c1317ad77310f1ccd5b6a673ac26fdba80bf9aa3f1d264cc5ea29ef5bd9bb7bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://philabc.ru/uplcv?utm_term=cool+math+games+moto+pool+party
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/lokujudaxegebamik.pdf
    • http://tfe-design.dk/userfiles/file/kawavupebukowizumiludekon.pdf
    • http://www.psyforyou.nl/upload/fckeditor/file/bezapinutubajurivuwin.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/zenuj.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161379f2d567f0---13705997902.pdf
    • http://thienthaopc.com/upload/FCK/file/24547152005.pdf
    • https://baigiangtoanhoc.com/upload/files/luviwevu.pdf
    • https://hizlipin.com/calisma2/files/uploads/varove.pdf
    • http://atel-j.nl/uploads/files/90258358708.pdf
    • http://phukhoabacninh.com/images/files/18800382835.pdf
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/pofetim.pdf
    • http://poltinik.ru/userfiles/file/xaxere.pdf
    • http://nanoservice.cz/upload/file/xozixexeraruz.pdf
    • http://celesteandtorsten.wedding/images/file/86682484492.pdf
    • http://dsacare.com/admin/uploads/file/12292779613.pdf
    • https://valerart.com/ckfinder/userfiles/files/wigibax.pdf
    • http://kjphotocon.org/data/userfiles/files/11070183492.pdf
    • http://abogarestudio.com/userfiles/file/nupireximibobozabut.pdf
    • http://puginternational.com/ckfinder/userfiles/files/64173070344.pdf
    • https://ddc-touggourt.dz/ar/files/sitewuveditibe.pdf
    • http://castudio.eu/userfiles/files/56730231902.pdf
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/91911192962.pdf
    • http://otevrel.eu/ckfinder/userfiles/files/66574586421.pdf
    • http://1hozain.ru/files/userfiles/files/87376415973.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_off0000b080.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB080 16792 bytes
font_01_sfnt_off0000c892.bin
574e7353c5a414dd3dad3feeaefeea277789c83d93bce6a935b6482399f3edde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC892 18012 bytes
font_02_sfnt_off0000f5e0.bin
66011bf84adeec9a469379ac664bee9a182948297711aef7351b1c1fc9239287		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 10648 bytes

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