Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82755a2a626f265…

MALICIOUS

PDF

103.9 KB Created: 2020-11-23 16:31:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7b68472b8c5a2e3a42ccc6cdb2490135 SHA-1: e56e419cb763905d4ad0b3c5f5e999b33db3a9d4 SHA-256: f82755a2a626f265641e3afb24b923ffee7c2d544719cbac308c77a67ed9c089
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, particularly to other PDFs, suggests a link farm or distribution mechanism. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or SEO abuse tactics.

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
  • 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://trafficel.ru/123?utm_term=poetry+for+dummies+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476127/normal_5fb58cadf0fe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382613/normal_5f8fc2c9915db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_5f939d29bb48c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f8841c8b5878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446651/normal_5fb640bf269dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402519/normal_5f91faac74f0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384470/normal_5f93a3a994821.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f9b6ba37909c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_5f936ccc51d22.pdfIn PDF document text
    • https://wizemeleg.weebly.com/uploads/1/3/4/3/134307012/b6f4cc13daec1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_5fa08fc7c6aea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453129/normal_5fbab63d40c9e.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/xumakomowi/order_of_events_for_wedding_reception.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/64085777950.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_off00014fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD9 4824 bytes
SHA-256: 2418e2b54c4acf97c944ef3b08f3925fc57ae086186e0253898324052b54e98a
font_01_sfnt_off0001604d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1604D 10600 bytes
SHA-256: 287f1b428fc644228581e63630f402351dbf01afadeffcd6e55e76189391b9ca
font_02_sfnt_off0001847e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1847E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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