Malicious PDF — malware analysis report

Static analysis result for SHA-256 5acb028f856b54f5…

MALICIOUS

PDF

77.3 KB Created: 2021-04-25 19:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b61a4e4a7b600135bbec1dc20673274d SHA-1: ddc33d4a8f60d87e53028013bea14f1a1adc51c0 SHA-256: 5acb028f856b54f5720f71cd0acd09cc69d5d3d7eb42a53d52fffad0788c55dd
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://seumenha.ru/strik?utm_term=shakespeare+sonnet+1+summary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408993/normal_5fefc7fbb6102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380863/normal_5fd6aae1dae1e.pdfIn PDF document text
    • http://funasowuto.getenjoyment.net/takukanavixonakizonu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485809/normal_6037395183c9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419650/normal_60682805acf57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480898/normal_5fe349c811d03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465564/normal_60473818cc586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372983/normal_60370a3333641.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444853/normal_5ff4d88ca2fef.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/likerajatob/wopeguja.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/monujinibiviwupulize.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/macbeth_act_2_scene_2_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/calder_casino_app.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/animated_gif_background.pdfIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_cf3dc0dde17346b5a4ff9b6f759545b3.pdf?index=trueIn PDF document text
    • http://ditanumugagoma.myartsonline.com/les_bacteries_aerobies.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/93962925133.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_1723629b06ed43259b37be9297582ca9.pdf?index=trueIn PDF document text
    • https://f8b57e9d-e272-4783-b6f5-6420e6b93425.filesusr.com/ugd/886b73_64fef0d91c4948649f1536ad40b2135c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xixonu/59201215363.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/kuvijebedovoneme.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_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 5348 bytes
SHA-256: 11bdfa05ad9ced59022b229585e443a653c564e567684a931c0d6e06842d57a6
font_01_sfnt_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 10904 bytes
SHA-256: 82a7167172ddb1f0a341ab4e38f9ff1e0c38f12f042b870f35f84f0e94a5cd8e

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