Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ba4dee7aa187f0…

MALICIOUS

PDF

69.5 KB Created: 2021-03-29 22:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8c6afbf1fd04e6ea3a92405034f61c2 SHA-1: b13914dbe4a381cf33cb6ef6e1dd29e0d1e6a1cb SHA-256: 98ba4dee7aa187f07f8965f822989aadd76604fb2dadba5712d42fa146c1a7ac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one prominent URL leading to a domain associated with link farms and SEO spam. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8570

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/award?keyword=animal+farm+vocabulary+list+pdf
    • https://cdn.sqhk.co/vuwipabobatu/cviaGbU/84288390234.pdf
    • https://janolonixo.weebly.com/uploads/1/3/3/9/133987325/wudolula.pdf
    • http://jegoxebiz.iblogger.org/17120649417.pdf
    • https://cdn.sqhk.co/vatukaso/efian9z/9201361640.pdf
    • https://jirogadipew.weebly.com/uploads/1/3/1/6/131606393/zixesabamoxiluviji.pdf
    • https://cdn.sqhk.co/bikuloxisage/Wjifidh/why_is_my_hopper_app_not_working.pdf
    • https://cdn.sqhk.co/gatuwaven/Fheicu2/18828479477.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pasawe/11773368844.pdf
    • https://uploads.strikinglycdn.com/files/bcdc8c1b-bda3-446c-b87b-bcaaab63313d/english_speaking_app_free_download_for_mobile.pdf
    • https://uploads.strikinglycdn.com/files/e3cab81a-f9ae-4ca0-b499-594602138406/what_child_is_this_chords_am.pdf
    • https://s3.amazonaws.com/lefemijip/nmims_bangalore_placement_report_2016.pdf
    • http://genividi.epizy.com/formosa_argentina_pontos_turisticos.pdf
    • https://s3.amazonaws.com/fuvidokibet/61320735183.pdf
    • https://s3.amazonaws.com/bomifabipi/nirefu.pdf
    • https://s3.amazonaws.com/vuliwisuwig/data_analysis_projects_for_beginners_using_python.pdf
    • https://s3.amazonaws.com/zerepuzuze/android_chrome_browser_stop_auto_refresh.pdf
    • https://uploads.strikinglycdn.com/files/eb559371-f90e-4e26-b35e-91be71496e2b/97168157411.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f7.bin
40981549d16a5cf3fc99b7bf526d72fc7426050c428b69910cfe75f9cd4346e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F7 5592 bytes
font_01_sfnt_off0000f5ef.bin
b6b90750cde710e9ec23beaf5c7d38dd125576c2ba46457b0fa0198da3275fd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 10052 bytes

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