Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b73f721d2f474f…

MALICIOUS

PDF

65.3 KB Created: 2020-12-17 20:53:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e3bc9226cdd6fc38f22318a2a7b9a388 SHA-1: 3958cb6c20cfcdf45b8f786d79fbf654bb9aa9ed SHA-256: e5b73f721d2f474f99abcec387fa880e832951760d899fbba38d720affe4e166
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple links to external websites, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'stem cells worksheet', suggesting a lure. The presence of numerous PDF links and a critical heuristic firing for malicious redirectors indicates an attempt to lead the user to malicious content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=go+go+stem+cells+worksheet In PDF document text
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/vubonowuvas-molipa.pdfIn PDF document text
    • https://vezuwuzasulibe.weebly.com/uploads/1/3/4/3/134354720/3d881c.pdfIn PDF document text
    • https://tinozuxitijerel.weebly.com/uploads/1/3/4/5/134528375/rafifesimenix.pdfIn PDF document text
    • https://dudafenerow.weebly.com/uploads/1/3/4/9/134900552/rinuxexanerimoruz.pdfIn PDF document text
    • https://tapenori.weebly.com/uploads/1/3/4/6/134657753/5c888e8d3590bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc64e6c2e34347c70694bb4/t/5fc97f0d87b36f46d4f45f74/1607040781357/3__5.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc65fa411f6a41984ab0936/t/5fcfc9a54e616b4e3eb05ae8/1607453094345/9_months_in_weeks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e87b7405-aa81-4d08-84ca-a89de353b402/basketball_legends_halloween_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8690b26-b99f-4f5a-b5aa-a1ffab56bb9a/crit_damage_rune_summoners_war.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/supaxuruzosapisoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/epo_guidelines_inventive_step_alternative.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/zugimovi.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/meray_pass_tum_ho_episode_1.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_off0000c11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11C 5188 bytes
SHA-256: 850c86f927c5ed0eddbae8f52e335318ad9d53fb063c83a019e2c6a4b882117b
font_01_sfnt_off0000d2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B7 11888 bytes
SHA-256: d355491023aaf83dc412f62fe75747439d44f05cd205370ef0f3832c74b1ff2b

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