Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f4efd00d816b69…

MALICIOUS

PDF

76.1 KB Created: 2021-06-07 05:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c728648f75173778b8b3d6d8542372c0 SHA-1: 9354a0b9fc170f9b293b9dc449395b612ec15f7d SHA-256: f4f4efd00d816b695f1a2e5fc04dceea7565e76f445a46ace39aba54e9a70410
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious content, as suggested by the PDF_SEO_LINK_FARM heuristic. The primary malicious URL identified is cructi.ru, which is likely used to host or redirect to malware. The document body, though heavily obfuscated, contains text related to 'hack injustice gods among us android apk', suggesting a lure to trick users into visiting malicious sites.

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
  • 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://cructi.ru/pbw?utm_term=hack+injustice+gods+among+us+android+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379611/normal_604b220ec57e0.pdfIn PDF document text
    • https://gifedoku.weebly.com/uploads/1/3/4/2/134234788/3999502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375907/normal_603fdfd76bb0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425506/normal_60279dbaa3eb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_60276a662fa0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404287/normal_60403428750cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481072/normal_6032b0e156472.pdfIn PDF document text
    • https://morefaxegilem.weebly.com/uploads/1/3/4/8/134890331/dugozujufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491926/normal_605151fe88210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415527/normal_602611320de9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383165/normal_604f8026b3ab7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467285/normal_603c19f602a26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_606696ee225ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457849/normal_6017c0bb8c791.pdfIn PDF document text
    • https://nobujowufovipi.weebly.com/uploads/1/3/4/6/134636268/2a6dcfe20618c4.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/1971ce77-c9d6-4c84-99ed-90429c9b798d/is_the_plant_paradox_a_good_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f3f0aab-f69b-4041-9c32-b4c7db859d09/sample_chemical_safety_data_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5ef2112-6db8-492f-b9dc-64803a53a8c5/things_that_affect_weather_and_climate_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eabcee19-a04d-4062-b0db-cec31521e77a/donalikuvuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3da3781f-5ba9-4554-a43a-d11b087b66a7/5987464615.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_off0000dc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 5464 bytes
SHA-256: 60292185ae8805287b134cda8e16556845a963de16975ed1c23aae15e2efc0e6
font_01_sfnt_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 22148 bytes
SHA-256: f953fece969557d9d36bdcb9c54095e2853784492daa94117c27385aefc289df

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