Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5415781d40658a0…

MALICIOUS

PDF

69.9 KB Created: 2021-09-21 22:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 77ca7f468eafb19ae669824466eb94b2 SHA-1: 779b45218866d71e7c702cbbb2fb40bd43eeb923 SHA-256: a5415781d40658a050c02f0eb10ad9eac72ba4dfc824e40f37d8351a38d27a73
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, indicating a likely attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to host many links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6474

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://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/8568856170.pdf In PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/81370285685.pdfIn PDF document text
    • https://securitydm.net/slicice/file/soleluxomanewobuwosowifad.pdfIn PDF document text
    • https://dcimx.com/files/40119373619.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/88371538158.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/6704338815.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/64912001851.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/63884931868.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/vomizomumugot.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/riburewogilaxunu.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/5150636278.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/nurig.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/sujub.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/3211e81fd7e82f1323437f4c79e95605/fawikivareboranumuvul.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/19718656484.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/tilidivinagoxovi.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/revevoviviwamogufon.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/muramoliwogupetamirelebep.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/62276173093.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/38162143050.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/h8ntksvl6rjgtl8bp8t5aefqcj/tidaligusomodujetabu.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/solifamab.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/33377978342.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/7892754407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mod+apk+homescapes+iosPDF 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_off0000ef75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 17564 bytes
SHA-256: 0406452e3890736a2312d8bdcfbded614fadcbf83d58addad3fcdbba828a4f94