Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab427ef737dcd88…

MALICIOUS

PDF

67.8 KB Created: 2020-11-23 00:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a50baa54bb75b5f022a6c479394b030e SHA-1: 7b407794d3802a1acedf47d3ce6b19ce51d5591d SHA-256: dab427ef737dcd88d36b841cf76c7d8ffc49d93e89cfdca74caa6d268c252883
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document's structure and embedded links suggest it is part of a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=informal+letter+writing+samples+for+grade+9 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4470832/normal_5faf6f013363a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5f87eb39b950e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411491/normal_5fb76f52d076b.pdfIn PDF document text
    • https://nakofasojerurog.weebly.com/uploads/1/3/4/5/134592478/4969082.pdfIn PDF document text
    • https://gajanokavas.weebly.com/uploads/1/3/4/6/134614817/229185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489846/normal_5fa8b26a52867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427498/normal_5fb613fcc5597.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4782fa58-f174-4b61-ad99-b1a849c03046/8174866864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8bd7f70-3165-4909-a620-8ed31bb72f46/catan_junior_spelregels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8de2c01-eabb-4195-925f-dbb9df9616ca/5972969886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b508a6c-bfde-4912-bc8f-c9045d2d3ebb/chase_balance_checkbook_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee751061-0410-498d-831a-cbcda2c06e4d/lexana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d5488a3-7b8b-4456-93ca-105dfa536dad/32297611837.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_off0000cd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1E 5544 bytes
SHA-256: c17e3550dbb763e144c99f42d8215ee64ce8b214f9b1686e230a9c2606a461a3
font_01_sfnt_off0000dff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 10148 bytes
SHA-256: aee4884ee72fcff473d73d8a4169f7339412f726f006927d72f2a0400e6432cd

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