Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ee539d9c01fc99…

MALICIOUS

PDF

60.5 KB Created: 2020-12-09 12:05:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f43cc1276a74e3c617115d116a904deb SHA-1: 29116be99c40850a425ecc9b4b4edf9b257c9607 SHA-256: e4ee539d9c01fc9917d1f10fcb1e699e55792901b9ec0f3dc9689a55d7655819
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffine.ru/strik?utm_term=yum+yum+donuts+merced PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f87510877fdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404523/normal_5f9915db89aa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_5fb6234615c2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5fc1afd1846d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459325/normal_5fb9d00993e1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_5f9ba6f1cc68d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_5fa827d31f565.pdfIn PDF document text
    • https://xonedapu.weebly.com/uploads/1/3/4/6/134654428/sejurajuwusukune.pdfIn PDF document text
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/1869590.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c26bf16-31f1-4a30-957b-673a35b2c6bd/50502621898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be1691cd-5450-493e-9506-de774667f5f3/adichie_we_should_all_be_feminist.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/31209051156.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/controller_gain_pid.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/tuposituvoworefa.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/guvonesidoluraw.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_off0000b241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB241 4908 bytes
SHA-256: c235a21a8caabeb2286d6fb889170e47303ff975dbeea6b008cf4aba970ea3a3
font_01_sfnt_off0000c2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2ED 10004 bytes
SHA-256: 7fbba3efeb33489e1d347b3fac47a210f8d4a9f5c481e724997e980f0d4402af

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