Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec429855ac956148…

MALICIOUS

PDF

87.3 KB Created: 2021-09-09 20:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fe5e8848e8d96503b39e89835bb6efa3 SHA-1: 7f365e0487c5f2ae253703951e01663c0842f39b SHA-256: ec429855ac9561488bc6bf3df407e0158da87137012f42a5cc29213ba9747a0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://renebeumer.nl/userfiles/file/vusepirusoviweperesuzal.pdf In PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/gimavukamakowemonunuvijen.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/mesadoselugapediwebatug.pdfIn PDF document text
    • http://packamate.com/userfiles/27969259057.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/52918361394.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/kojasubeveziwupinepi.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/75917820838.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/xabosazuwiketebukazid.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/11946894386.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/kotoxururuvoxaramix.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/4294365398.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/25109947704.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/relekowusogalubi.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/pamojegizewibakag.pdfIn PDF document text
    • http://esejsc.com/upload/files/71210004670.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/66015090385.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109042223387066.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/9fec04c2009258afad9e3cedcc58c55f/39770865074.pdfIn PDF document text
    • http://agrion.org/upload/fichier/32832482606.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/voxobuzawojikoxeliwexu.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210901122706.pdfIn PDF document text
    • https://adikketiga.com/contents/files/14236656652.pdfIn PDF document text
    • http://centromp.it/userfiles/files/83445335032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=play+3ds+on+androidPDF 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_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 17832 bytes
SHA-256: 74917f852852f3ebeb93fbec4e9aaa82383894d469a70fb88ec66ec8d684a5bc
font_01_sfnt_off00012058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12058 10296 bytes
SHA-256: 703c4464a3c3c5fc4bf61b9179ce7f8cf64186caeca458fa604196985bc4bc5d
font_02_sfnt_off000137a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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