Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b464b0f7a5c6a3…

MALICIOUS

PDF

52.1 KB Created: 2021-09-26 02:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8367cd9523b7c7ee71827abc18cbbb57 SHA-1: 47eb1cb283184cea0bdd2415ddd6e631c3736cf6 SHA-256: c8b464b0f7a5c6a3f5d1f643c380838e65fc77dbf430b497b4254bf0cc365e54
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The presence of multiple unknown-reputation URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7630

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://synerhu.ru/uplcv?utm_term=how+to+factory+reset+your+phone PDF link annotation
    • https://muzeumkonstancina.pl/attachments/file/12521704646.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/50979675545.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/mupezekipabotel.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/77630771544.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210903103604.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/bilojomojoxali.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/kidowutaguzawuranofoxus.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/90688783010.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/89285569511.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613986d6a47f5---luxonulu.pdfIn PDF document text
    • http://bckvalumni.org/userfiles/file/66124943339.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/5423600348.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/sokotutakumivumipodosu.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210909_E3B45092C72A0D3D.pdfIn PDF document text
    • https://pansky.ru/UserFiles/File/sanaz.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/vuzolajidasavulabutilot.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/zexonuvopubalutizatixot.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/35239663978.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94643223644.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/62625816961.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/31376900366.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/bamorisog.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/10542650235.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_off0000ae6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6A 14564 bytes
SHA-256: ab753d0c43f60b2f2c5bd271f3efa86c7e06072c988058c8528782ba5ffd20ad

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