Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d437b893cf5ea49…

MALICIOUS

PDF

67.7 KB Created: 2020-12-07 02:47:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5448ec1708533fbb0885868bc9942d90 SHA-1: 00ff7c98442a1fd3d2a90c8489b098b9c60f9c0c SHA-256: 1d437b893cf5ea4963a5e0c14498b1248a6135dde69e7eea75a293c50d07a989
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on Weebly and other platforms, suggesting a link farm for SEO manipulation or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or trojan delivery. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://traffnew.ru/strik?utm_term=bissell+little+green+manual+1400+7 PDF link annotation
    • https://diziwupufetut.weebly.com/uploads/1/3/4/4/134477772/lamezidar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383704/normal_5f8fc994ae4c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_5f8af5041a949.pdfIn PDF document text
    • https://lenukadizavubo.weebly.com/uploads/1/3/4/4/134492519/nawavizisedetagawix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463002/normal_5fadf27656658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425727/normal_5f9fcc0c81646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_5fbb5a6150c26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405930/normal_5f92f79c61d30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_5f9af51b76f8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379626/normal_5f8bdf17bb444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_5fc2062a211f0.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/fokapikow/labikipidoluk.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_off0000b96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96D 2972 bytes
SHA-256: 508955ceb1a861b62fccf92f840279c9a777a16d4839bfd9e630937738d47edd
font_01_sfnt_off0000c416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC416 5416 bytes
SHA-256: e9fed9f281965eaacf428bdfd0f5b7168d43103b1bcb0fb6e638e3d87ce2c454
font_02_sfnt_off0000d67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67C 12880 bytes
SHA-256: 2b7a89b314c214abfb658e85d073e2733d46c2fc05ae9e1b6c85ff73ac9347ae

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