Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d66548e47ea3ad…

MALICIOUS

PDF

64.0 KB Created: 2021-09-18 20:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 60c7b5c9cf2827aaaabcf9563dc2bdff SHA-1: 69f6cdd82d9e72eb53c6015e40d8f67416bf25c4 SHA-256: a5d66548e47ea3ad06f868b770b5731d6721fe1d126ea59c6eae4c378c4d6bb7
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, suggesting the PDF is designed to funnel traffic to a large number of external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7025

Heuristics 4

  • 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
  • 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://cructi.ru/uplcv?utm_term=thom+yorke+paranoid+android PDF link annotation
    • https://toocapen.com/files/46937933473.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/92841909226.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/57134848268.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/5675042867.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc00df0ec---68918995162.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/legevawulovotamexojawewaf.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/40703829004.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/finudixolivekumib.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/jorolunudulalolit.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/71412477792.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/mozapeta.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/wumagavanunafoxebafivomo.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/kofofilibogezodunesumur.pdfIn PDF document text
    • https://dcimx.com/files/86544154698.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/xobirosagale.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/wutexuxuxisedejagij.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/24871256648.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/40096968596.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/suzowan.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/luxabijowojeruremeje.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/28796727482.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/5964436896.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/15307721765.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/bamugop.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FB 17136 bytes
SHA-256: ce318045bc9502cc699553d324e8fe9b214c575c63086c48c3b9938fb3a4bdd9

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