Malicious PDF — malware analysis report

Static analysis result for SHA-256 92817105d6583ff2…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 14:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78b4da37047cd7ca11087999eac208a9 SHA-1: 7b565373b64051a08e21450507b07e50cbf05c9d SHA-256: 92817105d6583ff20f01b5177abc54dfb358451c1816081aa228845e3c6d816d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://beytarimcilik.com/admin/editor_resim/file/sorujizulowisuxi.pdf In PDF document text
    • https://giriconsultancy.com/content_files/files/22734249031.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/gobopove.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/38784567098.pdfIn PDF document text
    • http://ume.civilkozpont.hu/uploads/file/10866282900.pdfIn PDF document text
    • https://onlinendttraining.com/files/46464944559.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/35705986025.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/88167362648.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/2125223959.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/oxisekefira.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b6a7eebd---vojasavopibi.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/26922226343.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/75959774937.pdfIn PDF document text
    • http://fxlcd.com/upload/file/30125931727.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/fexapagexul.pdfIn PDF document text
    • https://deepex.hu/hirek/files/57327909495.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/41205782869.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/67910775671.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/digogebozurepib.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/zetibi.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/71548353436.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/3587753318.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/jeponodorumolorizidajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hot+adult+games+apkPDF 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_off0000e173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE173 17556 bytes
SHA-256: 329242b81907f4bf09417870c2b929dc62531b6d5b3850025e5b1a6c0a3e35df
font_01_sfnt_off00010eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAA 10620 bytes
SHA-256: 47b421633672750ae1e7b83ff1109132f99e568695f463c6815060257089dfc3
font_02_sfnt_off000126ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1