Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfb44f5f4ef716a…

MALICIOUS

PDF

69.2 KB Created: 2020-12-23 14:37:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8e3b00794a4dee2331d0e418ade3bae8 SHA-1: e6704d533dfa977ca887c97ec274bdf7242a31e0 SHA-256: cdfb44f5f4ef716ac4c255bfdae1d252fabc584e01fc619b07103a401d394522
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to S3 buckets and Weebly-hosted PDFs, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity.

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://trafffi.ru/aws?utm_term=causes+of+obesity+essay+pdf PDF link annotation
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/4503832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387715/normal_5f95d55600202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453105/normal_5fa4f6e0d0956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459034/normal_5fdc52d0b1c21.pdfIn PDF document text
    • https://pizolixes.weebly.com/uploads/1/3/4/8/134874149/2272aea7ef3e25.pdfIn PDF document text
    • https://sopopubepomexak.weebly.com/uploads/1/3/4/2/134265445/felobegijaxojovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384822/normal_5fb68f2f8049b.pdfIn PDF document text
    • https://vurifupilubat.weebly.com/uploads/1/3/4/4/134495287/duririrariw.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/tirimofufemukat/96043413468.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/tubojesewakibifodoki.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/64833376098.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/zalando_returns_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50b1c36f-f707-4f17-8b5a-73354e693eb9/zejutasafutukukinumav.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_off0000d291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD291 5056 bytes
SHA-256: 3c352e379110f1f274e187e09ba89b9d43e0f5063a9c9ea5788f5467e8567598
font_01_sfnt_off0000e3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D9 10696 bytes
SHA-256: 0e9c044996e205dd6aae31ae79f1b9f1818f7d8f1a0ea02b5264418378c19c2a

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