Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6cda23e2be484c…

MALICIOUS

PDF

60.2 KB Created: 2020-11-21 14:58:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 50ab135874009a4d98aa4cf99f0adb4e SHA-1: d678938133139f5aafa9bc495505736cff49d0ee SHA-256: 2c6cda23e2be484ca0f0a49f936d963cbe9f922719b6fa7d93679ec0886cc35a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffking.ru/123?utm_term=tale+as+old+as+time+guitar+tutorial PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447101/normal_5f9f28be9a3f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489853/normal_5faf2f17650bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5f8e9eb19a7a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_5f8a11e2c3ad7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369146/normal_5f8cfb6c6d88d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408482/normal_5f9a10816dec5.pdfIn PDF document text
    • https://mogunugive.weebly.com/uploads/1/3/4/3/134381007/d36343cb16a.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/e215cb01-3c40-4de2-be28-7553754f328d/principios_de_edificacin_progresiva.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/phases_of_gastric_secretion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/143fad8a-1e65-436a-a530-e7a8f9778fed/22365386621.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/95230618634.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/lifeziro.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/how_to_fill_ndlea_form_online.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/quantitative_data_analysis_process.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/transformar_8_m_a_cm.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/pajokegujomukaxo.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_off0000af50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF50 5092 bytes
SHA-256: 548c254e0df1144b4489b1f9944e22cb4ad2ae1c6196de2d1fa53da53e14cccf
font_01_sfnt_off0000c086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC086 10520 bytes
SHA-256: 000a5baf02f2ee5db78a97ae59b840b096325b419dcd28c956f6c076780bc94c

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