Malicious PDF — malware analysis report

Static analysis result for SHA-256 8009a1658cb84109…

MALICIOUS

PDF

95.9 KB Created: 2021-09-09 05:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 923de32eff39518712d173ed893790f0 SHA-1: dc859f42fec5060787f26ec886cd00b9823f0aca SHA-256: 8009a1658cb841098be3f4124d483d4d0c272bf2efac201a1c07246160606a2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely to redirect users to phishing or malware sites. The ML classifier and ClamAV detection further support the malicious nature of this PDF. No scripts were extracted, but the overall structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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 http://golfvillageonline.com/userfiles/file/xisetavutopupi.pdf In PDF document text
    • http://consol.hu/images/uploadedimages/file/40017519119.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/93148113515.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210909105615.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/16878844909.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/powelojexa.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202191154887769.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/96160778023.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/42247325409.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/74481439084.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/bimezepizuverudova.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/dirudifakugerotevumob.pdfIn PDF document text
    • http://ukrfirework.com/images/file/49970456947.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161364e39d2004---majiden.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/12618707962.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/gavijuxerabagatijebeb.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/rotanufixafelabu.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/gejur.pdfIn PDF document text
    • http://carbonelite.ru/file/lidebuvejonupox.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/39214347445.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/49270781101.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/4696245e7ff7c784c7fc60e2fbc095f1/63175834575.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/89847319528.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/vikifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dream+league+2020+downloadsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 16316 bytes
SHA-256: cecac62ddf9842e24e5aa295a7437217c35a03ea3258f310dcaaa5844d6ce37e
font_01_sfnt_off0000fbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 23624 bytes
SHA-256: 2d0ce810207c29c17150bbc4c32dc3e45812e499bce3819ae2d08c3753fe98fd
font_02_sfnt_off00013854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001506b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1506B 10828 bytes
SHA-256: 192ccf09789f2a279d864530a884efce7a14b903a3d113f4e26b6de1b796aac4
font_04_sfnt_off00016943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16943 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc