Malicious PDF — malware analysis report

Static analysis result for SHA-256 850e27bbc76ffbcd…

MALICIOUS

PDF

72.5 KB Created: 2021-01-14 14:16:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 730a6a1d59c001100865953deefcba4f SHA-1: 086de50475573a88216004d0bfc5559e2c224335 SHA-256: 850e27bbc76ffbcd9edf5b674310aea8865dcf036c6d8f8a2f877045854a9990
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic, suggesting it's designed to direct users to a network of malicious websites. The presence of external URIs and the ML classifier's high confidence score further support this assessment. No scripts were extracted, but the structure and heuristics point towards a link-farming or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://trafffe.ru/123?utm_term=palace+theater+elmwood+louisiana PDF link annotation
    • https://gipulafu.weebly.com/uploads/1/3/4/4/134442702/bc310450119090c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_5f95d62fbc0aa.pdfIn PDF document text
    • https://lotogifivetizub.weebly.com/uploads/1/3/4/3/134309957/netilonav-lopeso-bowoberuv-vatago.pdfIn PDF document text
    • https://faluwizux.weebly.com/uploads/1/3/4/3/134372305/gimawaro-buwobebadol.pdfIn PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/64312f.pdfIn PDF document text
    • https://munojafejim.weebly.com/uploads/1/3/0/8/130874523/midolipu.pdfIn PDF document text
    • https://totorososine.weebly.com/uploads/1/3/4/8/134892144/voforuw.pdfIn PDF document text
    • https://volokosebu.weebly.com/uploads/1/3/4/8/134871595/wubowilalux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491164/normal_5ff76c06976dc.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/xakapudakadu/the_ramayana_summary_by_r_k_narayan.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/tomeb.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/nixovasewitubaxabo.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/fakizizesepu.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/grass_by_carl_sandburg_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/mac_os_catalina_beta_dmg.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/kobudozajiwet.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 5272 bytes
SHA-256: 30c119feebe9ede9b7561a94fe2bf2eefe1b969e70704f430dd8c51183ce0f3a
font_01_sfnt_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 11240 bytes
SHA-256: 3ddbcda0eb068ef7c0e8d3e09cd3ff50a61e1e176fca5bc26fb2c4db86959aa3

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