Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e183abb83faa89…

MALICIOUS

PDF

63.6 KB Created: 2021-09-12 05:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d8bb045d8536ec807259a23183d8cf5 SHA-1: 70b8fb0ece9bef48bfbd38993689d8fe13fef0f8 SHA-256: 44e183abb83faa89e5c2fe0e4d0be0fc25296130e26dd2bf3e4fef4fb21287e0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true malicious destination. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9575

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 http://efuturesthai.com/uploads/file/zaximexujeb.pdf In PDF document text
    • https://tsydesign.com/userfiles/jws/files/58238232335.pdfIn PDF document text
    • http://haphadoor.com/upload/files/54882775136.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/21568479958.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/gofolefuwafekuwipibapel.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/tedifoxezo.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/59618710199.pdfIn PDF document text
    • http://willbramephotography.com/nabopevibajodirukomi.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/55877225631.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/78522951718.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/10056555938.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/xetatisanasowi.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca8a91c2e3---rixaduruvufowivunenuk.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/90737014577.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/lunaxafewejuwiwepovexe.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/16407655346.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/b04b8e7467bfcd2f45124f33f6aa807a/54108995178.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/tajodonogisutonovato.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/rixarajugijomizedun.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/67993300700.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/zuwiwiwixejapulawop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=living+history+book+pdfPDF link annotation
    • 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_off0000ca50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA50 16788 bytes
SHA-256: f43919d34d09f0778402b70aa9d18bae0d091736d4c62061767ab5276c8758ce

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