Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd8545863c6f1d4…

MALICIOUS

PDF

69.4 KB Created: 2020-11-19 04:35:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: fedc0f54c764e880f5b7092395771ec1 SHA-1: b7c17654f642e8a94d27e1cbb90aa1001da73e3a SHA-256: 5dd8545863c6f1d48f40e45ca501412ea3d9c2e38b6a58ef5874dbb5f053b41a
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 0.9998

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://traffine.ru/strik?utm_term=gender+roles+in+the+great+gatsby PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379049/normal_5f9a0dec8512a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389581/normal_5f97b369bd70d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421640/normal_5fa036738a2ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_5fa8113a98083.pdfIn PDF document text
    • https://pefuxagofir.weebly.com/uploads/1/3/4/3/134359429/8636599.pdfIn PDF document text
    • https://topejaliwas.weebly.com/uploads/1/3/4/3/134305960/lazanu-woxox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_5f923ec3b5809.pdfIn PDF document text
    • https://vejesare.weebly.com/uploads/1/3/4/4/134493146/kivewimepoju-mikeluf-soxudokebusi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_5fa5e9880bdb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499319/normal_5fb56a80a2ac1.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/popagexexoza/available_siberian_kittens.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/dogagusijudupu.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/autocad_2015_basic_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/baahubali_3_photo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4799148b-5cd1-425a-92df-82cf8857e7bd/deer_run_elementary_school.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_off0000d3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FD 5360 bytes
SHA-256: 98866c8749492b9ac39bb719476f2d01c3a190167436ede80b44438546af6f96
font_01_sfnt_off0000e636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 10028 bytes
SHA-256: cffac82454d9b6a970f4e1549a9173f10c03f12324ab0fb525808aa59c92a710

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