Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c93cccf12303d10…

MALICIOUS

PDF

92.6 KB Created: 2021-09-12 00:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 57965eaf8fbeb2856d153c61a8eb5bf0 SHA-1: c830345d5dc601da86e303b1a395093b7c427e11 SHA-256: 7c93cccf12303d108a10903571a674263e19f5e20d1c296c490a1f1c8113edc8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, redirecting to numerous external URLs, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://smidgel.ru/uplcv?utm_term=oval+face+shape+hairstyles+male+thin+hair PDF link annotation
    • https://solener.info/ckfinder/userfiles/files/gakaliruvukonozanozaxe.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/luwafoligadeku.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/24880418922.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/5619072485.pdfIn PDF document text
    • http://tzsunup.com/upload/bepaguxif.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109041836587003.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/ziwap.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/52268309392.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/24168974656.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/97591441150.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/42607388469.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/49203239545.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1a9d68d72---saradugakanosifonulogadud.pdfIn PDF document text
    • https://etimes.mn/uploads/files/60465409755.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/4450343590.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/wafanowujezudubexasuraguz.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/47826496411.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/tozumanupavoxekuzeg.pdfIn PDF document text
    • http://gibisch.info/files/files/88038208187.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/jireburofexufufitametab.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/kovexudakalexage.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/68342458910.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/vetifogose.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/rexegozoxelepikoke.pdfIn PDF document text
    • 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_off0001022e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 19200 bytes
SHA-256: 5d13cb15982e3a1c6546e94b6abadcf8ef09d45dc31269af136e47a4170d8cce
font_01_sfnt_off000133e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF9 10832 bytes
SHA-256: 685122f62542971e0ebd937755a7cacc2774592ad1980185870b3dad8ff0fbc0