Malicious PDF — malware analysis report

Static analysis result for SHA-256 de11046a5ff85be9…

MALICIOUS

PDF

78.2 KB Created: 2021-03-02 00:57:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c29ecd5d84fcc39940cd2808c899bba0 SHA-1: b79cf3c7728be56908244bc5d61380939d73d413 SHA-256: de11046a5ff85be96806a5e6f64818dc3ee158c0f47a9c2e0b303460e01c79bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, indicating it functions as a link farm. The primary purpose appears to be directing users to a large number of other PDF documents, potentially for SEO manipulation or to distribute further malicious content. No scripts were extracted, and the document body was heavily obfuscated.

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
  • 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://seumenha.ru/wix?keyword=touhou+orin+dance PDF link annotation
    • https://zepazilarewar.weebly.com/uploads/1/3/4/3/134310653/nelujajodep-pumonezuv-pirabu.pdfIn PDF document text
    • https://cdn.sqhk.co/bikawegaj/jgAijaU/41270955528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480589/normal_5fe2135772025.pdfIn PDF document text
    • https://cdn.sqhk.co/lowixadoges/fibdYjb/whatsapp_status_video_download_2020_love_share_chat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481836/normal_6002e1c7d3998.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471455/normal_5ff4c07a5a70f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380705/normal_5ffda37fd5b03.pdfIn PDF document text
    • http://tarusexozof.iblogger.org/67307705145.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_6028f7c2819a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kikexufan.epizy.com/cheap_semi_formal_dress_shops_near_me.pdfIn PDF document text
    • http://memajale.epizy.com/rise_of_kingdoms_beginner_guide.pdfIn PDF document text
    • http://fojiguxojed.epizy.com/71137009582.pdfIn PDF document text
    • http://mejadub.epizy.com/chefman_air_fryer_6._5_manual.pdfIn PDF document text
    • http://vupafigimewex.rf.gd/39479108650.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 6104 bytes
SHA-256: 99fffcd7a55269e563db36498eaccab8af1b95680940d997f143fcc580c1ef4f
font_01_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 4764 bytes
SHA-256: 95262986def5696eac3ed8d379ed6d239bdb03cd212b87ff97b9e5e92d46818d
font_02_sfnt_off0001093c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 10196 bytes
SHA-256: 7dca44c8f3ccb6710efd9403ba8b7d9708dc2fc06b7de8392484a2c3b6774ce1

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