Malicious PDF — malware analysis report

Static analysis result for SHA-256 5379b51cdf6019ef…

MALICIOUS

PDF

40.0 KB Created: 2021-09-29 00:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 16c24a33ebbe9a10787166988b63e6d9 SHA-1: 8ef50f5ecc80749ca61a38eed25c0b7f3f7b9456 SHA-256: 5379b51cdf6019ef646f3fadddaeeeed4e8f3f30f8f22e6407f4a5813d79200d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as a phishing lure due to its image-only nature and embedded clickable link, a common tactic to redirect users to malicious sites. The presence of numerous distinct hosts and the use of UTM parameters suggest an attempt to obscure the final destination. While no scripts were directly extracted, the heuristic 'SE_LOLBIN_RUN_COMMAND' indicates potential command execution, and the overall structure points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8259

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 40 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://helloslow.com/data/userfiles/files/munixas.pdf In PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/39271846691.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/mipumuxog.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021092905110499.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/tefamevujuw.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/8999291218.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/zagizem.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65819109257.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/6927920092.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/10962863208.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/27683226368.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/59048572391.pdfIn macro / runtime command snippet
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/fojaritolebasigosidonawo.pdfIn PDF document text
    • https://centrehistoriquesndbc.com/ckfinder/userfiles/files/8212229985.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/51653197545.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/51817196997.pdfIn PDF document text
    • http://matras-devison.com/upload/file/womuk.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/vokuxu.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210909083627.pdfIn PDF document text
    • https://festacontinua.it/public/file/zovogemovuvusunez.pdfIn PDF document text
    • http://viral-list-monstIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+keyboard+gonePDF link annotation

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