Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a578b5e24ff5af1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-23 00:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e724b429ee2978f8858dd351932209d7 SHA-1: d3433040476b710807dbdf24f9f47005f39fb2aa SHA-256: 8a578b5e24ff5af1cdea01e60d18d792d6c03110cfc7b12e3d2f04dc4167077b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://grafiport.com/userfiles/file/suzapixexumutumazi.pdf In PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/457h8kl7a3bc2j5jd14ej1m8r0/dagexibejimaperow.pdfIn PDF document text
    • http://chenruichem.com/upload/files/donenigamanodifupowug.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/24021526797.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/xutonijoxikiforiwuxikedot.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/43924151348.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/61670549400.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/jovuvebakaxomomako.pdfIn PDF document text
    • http://gyliver.ru/files/files/wetamijerabenu.pdfIn PDF document text
    • https://nakshistudio.com/ckfinder/userfiles/files/vowasenaroluje.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210921094702.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/soferakobupaz.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/8852470140.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/digukodetikimebob.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/xusuviwevewodun.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/75630788780.pdfIn PDF document text
    • https://citytrafik.nu/images/file/17867422790.pdfIn PDF document text
    • https://unaizahic.com/Files/files/gitami.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gunefofamu.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/wivuneresejuvomumofesego.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-5/20210905183116559042.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/vifejuniv.pdfIn PDF document text
    • http://wixoon.hu/upload/file/vakimuwenux.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/mojuratow.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/41617598928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=download+dragon+city+mod+apk+unlimited+gems+and+money+and+foodPDF 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_off0000d909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 18344 bytes
SHA-256: 47d5bf7758ce8026c415b25ee87586e2dc6e2286948a6a3049cf7f3680606fb9
font_01_sfnt_off00010903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10903 11356 bytes
SHA-256: 67e7fb9ba3ff8d684ad29367bf9e3274433989f788f5d6d53222f0fd8e6aeeb8
font_02_sfnt_off000123a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1