Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55820e51408e9d7…

MALICIOUS

PDF

69.2 KB Created: 2021-01-13 02:20:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ab78e1984f4e9c87351202f3ab9a00df SHA-1: 0ba4020f3bcd17b23a42cad8f98585b33150f1fa SHA-256: b55820e51408e9d7d8403bd686d4a2722737439cc8a95d985dc364424acfc2c5
196 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. It uses a password-protected-archive lure. 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 0.9998

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://trafficel.ru/aws?utm_term=align+textview+to+center+android+programmatically PDF link annotation
    • https://site-1174179.mozfiles.com/files/1174179/du_screen_recorder_app_download_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/EWsjjhl/24244756875.pdfIn PDF document text
    • https://soxokelu.weebly.com/uploads/1/3/4/4/134494323/zisagixumofo_zujulegiter_toroxuke_rivinuzefafu.pdfIn PDF document text
    • https://cdn.sqhk.co/rowalulo/igjhqgc/perigapiwojipivo.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/suhhgew/muginifekex.pdfIn PDF document text
    • https://duxojavuse.weebly.com/uploads/1/3/1/4/131483254/linegalafuwexof_bajukiveko_dotutafegazep.pdfIn PDF document text
    • https://site-1173237.mozfiles.com/files/1173237/radiologist_salary_california.pdfIn PDF document text
    • https://site-1178488.mozfiles.com/files/1178488/76202752806.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/zonebon/overleaf_latex_resume_template.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/77174873083.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/91626423134.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/matux.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/call_of_cthulhu_free.pdfIn PDF document text
    • http://schemas.android.com/apk/res/androidIn 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_off0000ce73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE73 5528 bytes
SHA-256: da7c3843bbaa015274debeba7413c81e9e9b328b018eb0071ac826adf8f9a0bb
font_01_sfnt_off0000e149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE149 11340 bytes
SHA-256: c04c5fcd739c6afdde7c1a8bb8cb865106d60e7aecfa18fee5b23d9462f02522

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