Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3721f49a5de100…

MALICIOUS

PDF

74.8 KB Created: 2020-11-26 18:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7b6cd05ece020db1459273e1d2a7b488 SHA-1: ef609e34ff7807cdda74cee9016d4d85c1cd0c2c SHA-256: 1b3721f49a5de1003de69ec4c2b00ff905b881796f00f73132c1091be7a3f3a2
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to potentially malicious domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's purpose is to redirect users to external sites, likely for malicious purposes such as credential harvesting or malware distribution.

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://trafffe.ru/123?utm_term=best+neighborhoods+in+cleveland+for+families PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480170/normal_5faad11142ef3.pdfIn PDF document text
    • https://wivixilor.weebly.com/uploads/1/3/4/3/134371520/9967434.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/82ce14ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372101/normal_5f8a76478ea87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_5f94469637ab3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5fa64d2c33e5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_5fa0a47eabfe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_5fb5b9295500f.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/d8e0be4e-b7ec-4d7d-b664-7a2ec1a3646c/80244815992.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/flight_rising_familiars_list.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/77483457870.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/kikinikukaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/badekosexanajefag.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_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 5684 bytes
SHA-256: 906e2ef1065d70aaec344fee2e9852223d8098b2669e63818a4b9ab7b04f8256
font_01_sfnt_off0000f8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 10900 bytes
SHA-256: 173369b63e357386b5362d0ac5bb616fe1c1b1818c1aa9d0f987c82f228e9c2e

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