Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b930b7524e91131…

MALICIOUS

PDF

65.5 KB Created: 2020-11-10 21:19:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4219f35fb7d8c5416d66ede43f052f04 SHA-1: 975d84adf01797749bdf65edd9e74bc1cb89eda9 SHA-256: 9b930b7524e9113148a2eb8a8345da4a4fab04bc182a1c293f16fd535e9a6cac
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://trafffi.ru/wb?keyword=fornication%20definition%20in%20bible PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378410/normal_5f8ea2e01980c.pdfIn PDF document text
    • https://nekizinatuzi.weebly.com/uploads/1/3/4/3/134325328/4303794.pdfIn PDF document text
    • https://someradajisifu.weebly.com/uploads/1/3/4/6/134669983/5647521.pdfIn PDF document text
    • https://bufazojilenove.weebly.com/uploads/1/3/4/6/134639622/moguzuz.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/tunenijexe/human_sensory_system.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/super_smash_bros_flash_unblocked_games.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/materiales_odontologicos.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/59212412954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc173e63-a3c9-4eaf-a2e0-1706bc735e1a/16394449256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9365af69-5783-41e7-9196-e877c43b8590/percy_jackson_movie_download_dual_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eb99c91-1bf3-4139-937c-705902dd8b48/murerugiger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c7aa30f-5d1a-4d03-b175-c089da57b854/vedijawadapimamasala.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/vopodegajonoxekiri.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/43013602271.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_off0000c51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51A 4932 bytes
SHA-256: a6225b50ed5aaca573b472f79ea09e816ff0ca35583b1f975bb80a8a60998850
font_01_sfnt_off0000d5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F3 10312 bytes
SHA-256: df80eb5e0f812883524d9611259e3315c9db2663265f639795c55aacbc51c6d8

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