Malicious PDF — malware analysis report

Static analysis result for SHA-256 0354abd344f69e9c…

MALICIOUS

PDF

68.6 KB Created: 2020-12-23 19:54:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0e78fb24150f5848434469971729739e SHA-1: c84c1f331c6792b26183fc1adca235bef18ecfcf SHA-256: 0354abd344f69e9c122e579e317bff6ad1b194fd8f88d01d0ddc88c93723d07f
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially corrupted, suggests a lure related to medical sounds, likely to disguise the malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/aws?utm_term=chest+auscultation+sounds+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413016/normal_5fc2fbf461c3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5f8f091b66db1.pdfIn PDF document text
    • https://zovarufegurer.weebly.com/uploads/1/3/4/6/134625168/6292dd0dfcbe.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/5cc7d1dd-54d9-442e-abaf-cc6862e704d3/25732930405.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/bolafaxamogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f58e1306-ba6c-4d24-ba6d-4c6045fc4aae/63562482047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75698881-64e3-455e-a885-5a429a57194e/the_advocate_divinity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2209bb0-9fd4-4c17-9835-bd0528345a78/3466392565.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/fazaforebiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01fa910b-5620-4970-a5ec-9c33c45f5b21/misery_by_stephen_king.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/614d6112-f406-43fb-90f1-9eafb3f2c3f9/kodovexakutesipox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4a0838-07a5-4da7-89cb-9b5b6b8795a5/piccolo_dbz_age.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7ce97de-6846-48ab-a560-74ecc9fb7439/tornadoes_telstar_mp3.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_off0000cf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3B 5052 bytes
SHA-256: 97319ba1cee001f8b9ee59e9ae22c2167f83a148ab3508b31aedc9f4f5aa3363
font_01_sfnt_off0000e066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE066 11284 bytes
SHA-256: 282f99e1482f47af9110c683d6cd7670e6cdbcb1cae1c8a3c58b3b88899cdb7b

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