Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4079853374e7ab…

MALICIOUS

PDF

80.4 KB Created: 2020-12-02 00:19:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 84c2f7ed2fff17687cd5532c84accdc9 SHA-1: 1bd398358c668bdd7af1601d4b5a200d019a0883 SHA-256: bb4079853374e7ab4054cdccc6b09450b01c4c9049565bba39509a2ba7c72809
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

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://trafffe.ru/aws?utm_term=shooting+games+for+pc++highly+compressed PDF link annotation
    • https://gimatiderimu.weebly.com/uploads/1/3/4/7/134774165/0cc07e738e.pdfIn PDF document text
    • https://jazafojof.weebly.com/uploads/1/3/4/3/134310209/a138fd.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/dd65c9da-3cf0-49f0-b3af-ee72dc7e3401/18436603326.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cbc7c6d964583621a279/t/5fc0fd05f3de5e49b587810b/1606483206077/transport_through_the_cell_membrane_worksheet_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc34393405d5340f338f1f3/t/5fc6a363645712565425eefc/1606853476662/20010762576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f7918ff-a1f7-40f2-a448-47169b3fa623/momuxosegenasuwirofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/766affbc-c60c-4b80-88c1-7e5757934a77/pexubuzonoxotuvudo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc55adea13a450bab12175e/t/5fc683c4fa04221c71023e9a/1606845382252/bouncing_balls_noise.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/the_biological_degradation_of_cellulose.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/xadolisirekupu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe15c96457125654024c24/1606292942788/20321437686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d864cc-5962-474e-b87f-41bc64f1000a/43190340078.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_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 5776 bytes
SHA-256: 3bd10e52d524220dcd9651b7c3fdb4542e2210873176bad6c70f860c71038551
font_01_sfnt_off00010f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 11060 bytes
SHA-256: 3aa774b80e4aa4bd3dd1e47641b87596c4fa4f47f789e007aa161b4b37fe13be

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