Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e17fdaedda6d0e…

MALICIOUS

PDF

74.7 KB Created: 2021-04-06 20:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edf61ed7911d5f99f6957dd0ee7d61d3 SHA-1: b1c4f07a4f49c331e50fa7f178ae839b085e4d30 SHA-256: 23e17fdaedda6d0ee59a1b25612c391c13339afdb43253661c00224c2c082013
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous external URIs, many hosted on disposable domains, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to its creation, but no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/wix?keyword=ap+environmental+science+review+questions+chapter+1
    • https://static.s123-cdn-static.com/uploads/4489035/normal_60076074b29bb.pdf
    • https://cdn.sqhk.co/gisepavuv/1vghhhn/intelligent_personal_assistant_in_apple.pdf
    • https://static.s123-cdn-static.com/uploads/4376610/normal_60067d4de979a.pdf
    • https://cdn.sqhk.co/buvaboda/jGXOiiC/43893058330.pdf
    • https://cdn-cms.f-static.net/uploads/4426945/normal_60259b2a7950f.pdf
    • https://cdn.sqhk.co/zimuteraf/fhcghOJ/43634838916.pdf
    • https://cdn.sqhk.co/lazodadevab/iiiiaic/donososo.pdf
    • http://risiwivozival.iblogger.org/49861249767.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xeroguru/excel_data_analysis_tool_regression.pdf
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_d952621865d64d2bb869b43e7fd87782.pdf?index=true
    • https://s3.amazonaws.com/fowikorejodi/border_form_bootstrap.pdf
    • http://dimesagir.epizy.com/gifapaziborowixesatogepa.pdf
    • http://josilofogi.rf.gd/17705083070.pdf
    • https://s3.amazonaws.com/labitajaxatufib/auto_repair_information_software.pdf
    • https://uploads.strikinglycdn.com/files/fc64c826-88d1-4eda-90d3-33e9c50a3fa7/24047014003.pdf
    • https://uploads.strikinglycdn.com/files/d2510635-3cf6-4662-8174-54fad626924e/migilotamokukigotozogif.pdf
    • https://s3.amazonaws.com/vigevot/who_is_the_most_hated_kpop_idol_meaning_in_hindi.pdf
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_871a398efd8440ec8f2354b4b5046cc3.pdf?index=true
    • https://f27bca7f-571c-471d-9e77-92385e6dfcd0.filesusr.com/ugd/9a0fa1_7636bbab947e4ad8a3517f7a9d7a6e17.pdf?index=true
    • https://uploads.strikinglycdn.com/files/500e7a09-6864-4edd-aa41-d68cbf765c31/27887275621.pdf
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_84b515a37022433b8be4079eb9056629.pdf?index=true
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_20384325870c4715bd6f23b63ee9746c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4dc.bin
6369331bebe05f5c11de6607a4d3f61f0d7e6ec3f413d95f9737c7a60ead4eef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 5492 bytes
font_01_sfnt_off0000f779.bin
ddd01561e7c83440e111a7a7c700c4d9a8105c4b2209cd659e71df5f44fc2243		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 11092 bytes

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