Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c0714ef48c7190…

MALICIOUS

PDF

73.6 KB Created: 2021-02-28 13:11:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 678f23f5485df5835cc31a0ecaa3bc78 SHA-1: 4634cb15d252867a83bee6b3b7ea1890294b28ba SHA-256: 48c0714ef48c7190823cdd0edfca1b1e5d5b5dc5d0d37e7cbde53e9d79b31d75
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 a phishing trojan. The document contains numerous external URIs and is described as a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious websites. The presence of embedded URLs and the nature of the heuristics suggest this file is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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://leonvi.ru/123?utm_term=common+core+state+standards+math+kindergarten PDF link annotation
    • http://juzisil.22web.org/puvadisebivelavozitawa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501214/normal_60039b2f0c008.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481166/normal_5fe4f7c073368.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/Z5HgdWp/deeeep._io_beta_tree.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413454/normal_5fed27bbd5f68.pdfIn PDF document text
    • http://ralugugifoxatir.scienceontheweb.net/bebebuvogafarajob.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/hh2jcuM/sovatonagiwuruturidudisez.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/h4gcrji/choice_of_the_ninja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5fcd5f3cd16c1.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/dFE2njc/princess_peach_dress_up_games_online.pdfIn PDF document text
    • https://cdn.sqhk.co/zujubokave/igjhgcl/gamer_wallpapers_for_mobile_phones_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382639/normal_5fdb722213e21.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/hdihohh/46788546208.pdfIn PDF document text
    • http://netuporaju.iblogger.org/clarion_car_stereo_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390999/normal_6029ae4633e79.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/BghJeLg/best_pull_the_pin_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xatudoxi.epizy.com/water_cycle_diagram_worksheet_high_school.pdfIn PDF document text
    • http://figavexujofivu.rf.gd/akhiyon_se_goli_maare_status_video.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_off0000e3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 5292 bytes
SHA-256: ddedeb8f3f06d9c9a118072c74f80ed43cdc00529c7f49851b35b92ff2102361
font_01_sfnt_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 10296 bytes
SHA-256: b342252ebd89514f994b469a79881535b2202716bb4cf50335b427943f5052bf

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