Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a9d0d724b62472…

MALICIOUS

PDF

73.9 KB Created: 2021-03-06 16:09:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 476a1cc6eb736c7b520871e1208e5329 SHA-1: baa25c3dc9d359e24ca2a5ba2ed656f1655cc715 SHA-256: 16a9d0d724b62472733b05f1464524c6323d4c35c03f1a74a0acde92935235d4
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, a technique often used for SEO farms or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan payload. While no scripts were directly extracted, the PDF structure and embedded URI heuristics suggest it's designed to lead the user to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=the+story+of+arthur+truluv+audiobook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418178/normal_5fdc32f12bcef.pdfIn PDF document text
    • http://santaparker.store/tinubufejuxu2iaet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499319/normal_5fe9789d37737.pdfIn PDF document text
    • http://dvigatel.guru/7935472235vyii3.pdfIn PDF document text
    • http://misstourist.info/95459420874mib38.pdfIn PDF document text
    • http://good-production11.site/63365480783bgt7s.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/ddd15808-8dbf-45d4-beec-0a456c851a0c/samsung_smart_tv_55_inch_curved.pdfIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_9cb3dacf1e64456d8436e3cf624f29ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xomudufe/63483561478.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/44978844156.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/playground_equipment_cad_blocks_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/wutirekukiboburivaler.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/directv_channel_guide_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c680199c-4cf1-4a2a-92a1-6077e4606cfc/tamaz.pdfIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_9b0d0f0c9f1e4d02b7ed8f879a251c0b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/how_the_court_system_works.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/sadasapesinodiki.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/debijadud.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_off0000e453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE453 5308 bytes
SHA-256: 90979d8d2df21b40a94224249b87561385b8afd7045daac4999d30ee1514e8e9
font_01_sfnt_off0000f664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 11148 bytes
SHA-256: 2b3dda12ce40a86c42a7eff18f3e4fe1c96a08ed35ed0d300dda52d76b2f74d8

Open this report in the interactive analyzer, or submit your own file for analysis.