Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ac085a1c9cd869…

MALICIOUS

PDF

76.0 KB Created: 2020-11-23 14:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 683b6587318ebaacac7db6aadb27a68d SHA-1: 128e5cb636df933742c5ce06138be62c3d9b3703 SHA-256: f5ac085a1c9cd869cd9fdc9c003c192c2d8fde3565431776779f95f9180b56c6
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 0.9998

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://traffnew.ru/strik?utm_term=pastillas+verdes+para+adelgazar+meizitang PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446489/normal_5f9e1f0e8b227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_5f8c03102090c.pdfIn PDF document text
    • https://xezepumufemab.weebly.com/uploads/1/3/4/5/134589658/2e0cba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490366/normal_5faa65a197abd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402486/normal_5f90a887b15db.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/tesotiwapax/the_undiscovered_self_carl_jung.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/sobize.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/math_hl_option_statistics_and_probability.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/katame.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/it_worksheets_for_teenagers.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/34242168910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fec428e-208f-4c13-b7a0-911108d6dd57/noranowifupomamejum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a89ea9c-2e72-40a8-a7fd-958575eff4cf/19524251761.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_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 5392 bytes
SHA-256: a6ac1665891995fc5c1259262b05d6827b816094e8612887549679a4c5b87db1
font_01_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 11976 bytes
SHA-256: e54ec0bd7f8cd66ca7b00c3f86ec3e01a79c2eed5384013a9f2a6bf96f0e446e

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