Malicious PDF — malware analysis report

Static analysis result for SHA-256 3728d32e59fc23d7…

MALICIOUS

PDF

71.7 KB Created: 2020-12-24 14:10:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 58e43aea2ead763b9dc028d73a4f3a58 SHA-1: d4d84d58abd564e8a4f41b108c9af23f8931b8d4 SHA-256: 3728d32e59fc23d745dcde2001b4acde528f54834dc8bb7f0cfde3c5cd0298f9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm of external URLs, with one prominent URL pointing to a potential download lure. The presence of numerous external links suggests an attempt to manipulate search engine results or redirect users to malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=download+free+mx+video+player+for+android PDF link annotation
    • https://ridawixesij.weebly.com/uploads/1/3/4/6/134660161/ae3cb70016ce01b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_5fa29ab7645ec.pdfIn PDF document text
    • https://cdn.sqhk.co/lizupasepafu/heWhhbM/share_chat_motu_patlu_funny_video_download_telugu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426063/normal_5fc52ee77559a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501029/normal_5fda8d2ead3bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_5fc2f70300de5.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/ed768744-0e34-4ccd-94ce-d58d4692b8f3/forosubedazibanunuvike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0931f6da-a9cd-4ade-b201-0d3c95f3cd39/silicone_bluetooth_keyboard_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34c1f219-d773-4d9e-a8c4-3d7c843855e7/3436147510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/887c73bf-57f9-4b0a-9b29-ebfeae95b444/bounce_color_discount_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34fb1c7a-11b1-4405-be7b-3c4024e8a93b/trke_paragraf_sorular_ygs.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_off0000dc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 5328 bytes
SHA-256: 42b19236cd881b9f3e294199aa453e04777318c9375e67b80c0aa256a4e4c40a
font_01_sfnt_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 10476 bytes
SHA-256: 455c9167cf2f1d90fe631354a34e4d5a364956449116c9a228ba6a5da33a6e4c

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