Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edbd086231e51bb…

MALICIOUS

PDF

88.8 KB Created: 2020-12-31 14:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 348d978f264f9f42f585775225fb7ece SHA-1: c4dd9b0ad0ce69f8fccca1469bb4874c480cb1d8 SHA-256: 9edbd086231e51bb530c83a01e60d903fe97bc736519eaebb3abba6e49c0b0b2
156 Risk Score

Malware Insights

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

The PDF contains a link farm and an embedded URI pointing to a suspicious URL, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://traffnew.ru/wb?keyword=battle%20royale%20fps%20shooter%20mod%20apk%20android%201 PDF link annotation
    • https://cdn.sqhk.co/ritafase/iicgfih/24392278610.pdfIn PDF document text
    • https://bejelubizibo.weebly.com/uploads/1/3/4/8/134870507/0b9b84bd.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/ab173755-1019-4350-aeb5-41ef99798141/25685351566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/673fb57a-bae6-4fb4-843b-9ca2abef79ee/7332953877.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/77981349779.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/bluebeam_revu_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/337cba6d-1c99-4ed6-a614-9be52a9bfbe1/soxipidikebagot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27e91875-0d69-4aac-beb4-b31100b36377/69134698876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51aafea4-928d-4000-82eb-ba46ea08fb7e/choice_of_magics_apk_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/784b10f3-b06f-41db-b5b7-8a677b090466/sofomodos.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012a97.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12A97 25048 bytes
SHA-256: 3e3af78c90e0adde419e67696bfa7d6df449374a666ae863278f9c514318b1a5
font_00_sfnt_off0000e7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 5548 bytes
SHA-256: bd39b44c062fd6c4786b2bd15ff4f23edd89bb905bc35afef2648d48fd376f94
font_01_sfnt_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 15376 bytes
SHA-256: d3971fba8a70d391370bc88ee790ea1cbd885ac0912a964882d48b116586f6bd

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