Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62b6c8326037f2a…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 13:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29ae9f58e13ef6179f63ce904c59a431 SHA-1: 4ae2e0e3a7fd12b8ae5a7d362994ce3bb0516e01 SHA-256: d62b6c8326037f2a809749ddcacb5a26ca923f67cb739cc3177f433302de1194
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV, indicating a known threat. It contains numerous external URLs, many of which are embedded within the PDF structure and appear to be part of a link farm. The presence of 'utm_term' parameters suggests tracking or redirection, common in phishing or malware distribution campaigns. No scripts were extracted, but the overall structure and URL distribution point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4862

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://laborke.ru/uplcv?utm_term=ben+10+hero+time+apk PDF link annotation
    • http://dae-young.kr/upload/fckeditor/file/kosizopumokexalalogife.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/24169089827.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614214e3b671c---59686187540.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/posivigoruxatusuvi.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/39480995447.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210903060050.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613956c2861f2---2087047400.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/79479794293.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/42519696561.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/47331715750.pdfIn PDF document text
    • https://anakmeong.com/contents/files/regagezakitudeka.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-4/20210904024311292119.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/wimizisipifepununotuz.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/45295383647.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/88342361754.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/bixokadudotaniwabarux.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/17294972796.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/84692451111.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/doxuredodovaridatejaxogo.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/96772836031.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/wirabuwiwuzoparaw.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/dotenilakedi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 10624 bytes
SHA-256: 1b2b3089ef169dc5a6b8c69f9f6111830746b93d1826cc4fc344f3a85b3f4242
font_01_sfnt_off00011d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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