Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd32dd2220c57d2…

MALICIOUS

PDF

66.8 KB Created: 2020-11-21 10:09:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 631130caf801446413b5912e2e662f08 SHA-1: bbae834df04330d1c9a5db7fc8e30360d9c34f36 SHA-256: dcd32dd2220c57d267578ccbdd5628e10cdb469a317b7a1630f0af6ecda14c25
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/123?utm_term=best+buy+paper+shredders+in+store PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379626/normal_5f9ed7af6f5e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412889/normal_5f9ca12302a93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423442/normal_5fa55028d670a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_5f94de14c3f75.pdfIn PDF document text
    • https://wejusapud.weebly.com/uploads/1/3/4/6/134614256/bomimibekagut_kitewibewoja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_5f95044dae2b2.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/sivanira/50919424442.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/pigogutigebu.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/66124237668.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/kenmore_elite_h3_washer_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/foseba.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/45181517188.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/catholic_church_hierarchy_vicar.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_off0000c958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC958 5308 bytes
SHA-256: 509bfdcc15d4545a3abee63b3387b329c2e3b927ef9d18fc598768257d661447
font_01_sfnt_off0000db57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 10280 bytes
SHA-256: b3b05425501f58d5c2069517fe6aaf4d9d5c63f7b54267edb4a0122f260e4fde

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