Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda5297ca035d617…

MALICIOUS

PDF

71.0 KB Created: 2020-11-14 07:12:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c29d666994ddbd8bcd6eae6476ca8e19 SHA-1: b59bd47030472a7acd3bb07bfa1235cfeaa1b331 SHA-256: cda5297ca035d6171e6adc30cde2d95611eef9d380ec4bc5b56618d25a56cd1e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector and a link farm, indicating a phishing or malware distribution attempt. The heuristic firings confirm the presence of malicious redirector links and a link farm within the PDF. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect users to malicious content.

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
  • 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://cctraff.ru/aws?utm_term=performance+appraisal+comments+for+leadership In PDF document text
    • https://sarixibaparuve.weebly.com/uploads/1/3/4/3/134382026/cbf44e43aef174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381971/normal_5f943eae2282d.pdfIn PDF document text
    • https://jedufopev.weebly.com/uploads/1/3/4/4/134490540/e572cd775d7905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_5fa636df90b17.pdfIn PDF document text
    • https://tiruzezisuwef.weebly.com/uploads/1/3/4/4/134499189/2154952.pdfIn PDF document text
    • https://semezuzuxikazug.weebly.com/uploads/1/3/4/2/134234688/6031798.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/saxefi/multiplication_table_of_300.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/gebazogajor.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/les_bascules.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/gixevoxifekupijopoberumim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e414bb7-eac3-4a9f-8336-c60bdd6bb97a/52206236474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40808b3d-27a8-4350-9b04-3064add17e5c/minumeb.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_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 5396 bytes
SHA-256: a3d27b005a4910c9dde54fd8dc7962fab880b9a8df3ddac068a1547431a2e947
font_01_sfnt_off0000ebb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 10444 bytes
SHA-256: 25ea98f8bf7a42cb0eeacc1ed53dc03ddaac30fb59e21ff38d1658a03159e81a

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