Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff712a14f7e1509…

MALICIOUS

PDF

62.5 KB Created: 2020-11-14 15:33:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 282f206381cda22f8c6a0fe2a0e9d7ae SHA-1: df69ee69c40d5f3b7a504733b1a5caf105c3018e SHA-256: 4ff712a14f7e1509a09136ed6421431d9c11b4de1b064c8d97773b1bb86981cf
156 Risk Score

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://traffset.ru/123?utm_term=6th+grade+math+projects+pdf PDF link annotation
    • https://lixezakokigek.weebly.com/uploads/1/3/4/5/134596317/vugobutov-toxoxeka-zaruxowikuz.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/35ecfb297ee5ee5.pdfIn PDF document text
    • https://jezitazosebizag.weebly.com/uploads/1/3/4/7/134700096/2796375.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/f78be.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/4549037.pdfIn PDF document text
    • https://kuvanipugeva.weebly.com/uploads/1/3/4/4/134445248/pafaxomoramuga_zipise_gojifupa_majoxopezide.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/nuvukivaxiren/79420551235.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/92611551994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/747503ef-2afe-4820-8201-92639d94eb73/mujiginevufup.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/41556647122.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/ansys_workbench_18.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/centrifugal_pump_operation.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_off0000b67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67E 5672 bytes
SHA-256: b5bf81808f5653af7919df018ff574fb71f97e24b721e8b5407bf9b0b68543f4
font_01_sfnt_off0000c9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A0 10560 bytes
SHA-256: 1c5e52782741aa02df9cc77bb190917f03a0d7bfc5d0eb86063d1b7b56794b57