Malicious PDF — malware analysis report

Static analysis result for SHA-256 100261502b821e7c…

MALICIOUS

PDF

64.0 KB Created: 2021-09-23 08:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31cd4e4debef7f8acf9358f94119f364 SHA-1: 10b4f6638daee89d6816ef3ad0667cdd335315c4 SHA-256: 100261502b821e7c096bcb87c9507c92fec4b219167c075e0bb1237f649009af
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true malicious destination. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7025

Heuristics 4

  • 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
  • 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://pixomot.ru/uplcv?utm_term=maze+runner+1+full+movie+in+english PDF link annotation
    • https://enilubricant.hoakhanh.vn/uploads/image/files/32990623924.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/biwaladiwo.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/zodovu.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210911_9F369F87234C5749.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/29585638498.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/78503912577.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/fuvazobedosinitidefo.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/naramomalivejopakunuragab.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/97770537876.pdfIn PDF document text
    • https://datawire.gr/files/files/8597542243.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/xivomigilukarujopuxosix.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/jajogenukavirosikeruke.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb470220cc---dupikaku.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/54134154474.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306cd144fe7---82411711305.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/zisilimusuwemavejidotomug.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210908083103.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/32392874824.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/viregubafoxopomuzupuxufo.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/xovitimijikigubep.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/jirolubogufanixelezovabof.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/87537926041.pdfIn PDF document text
    • http://gibisch.info/files/files/23098225193.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210923072535.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_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 10832 bytes
SHA-256: 3e10c0ceb82cd1284bb8f40a373666f2f9e0c40b3536e0a6cc58e5367ffccf63

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