Malicious PDF — malware analysis report

Static analysis result for SHA-256 841fa2ca2497661c…

MALICIOUS

PDF

82.1 KB Created: 2021-02-25 19:17:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0629fcf73e11fb8259d30b02673c1fb5 SHA-1: 92c8a6bb4050087ac8cf29b89b38264827861951 SHA-256: 841fa2ca2497661c641e7117833200c537c16060a651976c3b01057c1da78870
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. One of the embedded URLs, https://bologen.ru/123?utm_term=what+does+the+lamb%2527s+book+of+life+mean, is suspicious and likely leads to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/123?utm_term=what+does+the+lamb%2527s+book+of+life+mean PDF link annotation
    • https://cdn.sqhk.co/kikolibub/6h4CicR/52556341543.pdfIn PDF document text
    • https://keboxatoxumire.weebly.com/uploads/1/3/4/5/134591907/dc1b9835ed.pdfIn PDF document text
    • https://bukodagunotul.weebly.com/uploads/1/3/4/0/134012399/gutilutigulukisej.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/ijbcXNF/fairy_tale_high_heels.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453764/normal_5fee7493d3b25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384819/normal_5ff1611673c41.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/wifukedot/boa_duvet_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/68793326288.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/power_outage_report_houston.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/rifavekowa.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/guide_to_reading_body_language.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/23199627034.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_off0001006d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 5304 bytes
SHA-256: 49654ff27bb73d2c4d4fdefb5b1bbb2511432d78a9a9687d591eea0a4aeeaf15
font_01_sfnt_off00011267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 12168 bytes
SHA-256: 502ff10657eba7437b6d1c79b3a905974dd984ce8338280301c69aafb9e0bae5

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