Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb40c35c183227e…

MALICIOUS

PDF

111.0 KB Created: 2021-01-01 06:57:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 637cf17cd1c610d1a4e5aac26127535a SHA-1: 4d7777d89a4df4d83bf258f76a7f02bc49d1847c SHA-256: 7bb40c35c183227efcae462d16b3be12872fd13daf0d6d620f8f87639eba19fe
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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/wb?keyword=special%20agent%20oso%20thundersmall%20full%20episode In PDF document text
    • https://static.s123-cdn-static.com/uploads/4422168/normal_5feb081330ce3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409238/normal_5fb2efa9b18e6.pdfIn PDF document text
    • https://wusunipusu.weebly.com/uploads/1/3/4/3/134320006/8040031.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446015/normal_5fd7ceb444ed6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tigovatolis/cmyk_colour_combination_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/vinakazifefibedojiti.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/86222635005.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/jagitebumugulusa.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/xajaxupotuvubabinu.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/store_manager_resume_description.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/32791781070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c39606c-ffc9-45b6-9f1f-4985d58122e2/mogovovomufe.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/12286675468.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/wetesivezadudiduga.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001680e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1680E 5556 bytes
SHA-256: 7b29e8c212be69009b4d690d0b18f72f978e220cf37c40c199ff382b61ebb8cc
font_01_sfnt_off00017ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AB4 11252 bytes
SHA-256: a3feb291a38a62148d5573a2c86ccbb550307fb339effcd3a8f0f3798a3981ad
font_02_sfnt_off0001a0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0A4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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