Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a4ab0a7c8d1f33…

MALICIOUS

PDF

91.2 KB Created: 2021-02-06 21:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8871843dbfa30ee52056de96ddc08246 SHA-1: 1f670ce2cd751cdad99b4dee606e4442df4bf7de SHA-256: 80a4ab0a7c8d1f331105f009f39672361d458061eb38b182bc4fefce10d554cf
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing. The heuristic PDF_SEO_LINK_FARM specifically indicates a large number of external PDF links, suggesting a link farm. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9602

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 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.
  • 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://jottigo.ru/wb?keyword=dealing%20with%20grief%20worksheets%20pdf PDF link annotation
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/4eb7965c57e6.pdfIn PDF document text
    • https://rejasujewefem.weebly.com/uploads/1/3/0/7/130738882/2391078.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/31708066701.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/netacad_chapter_6_answers_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/tamil_devotional_songs_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/risuwaduwalaxetab.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/pegabamogaxejepazodejokin.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/59041920828.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/58658904333.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/pdf_file_format_example.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/diwifubofixelu.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/euphonium_free_sheet_music_solo.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/causes_of_stress_at_work.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/96617182502.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/fopokufaf.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000151c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C3 5456 bytes
SHA-256: a9d7afa42ca9c8077eee5dfb4adba11383c60a7ed51eec3efcecd5b1204a4744

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