Malicious PDF — malware analysis report

Static analysis result for SHA-256 deac87f42fc81943…

MALICIOUS

PDF

69.5 KB Created: 2021-01-25 20:11:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e2ba06befdcb3dd708872903d2ad14d7 SHA-1: bf1da1595f2d85049afcce5cc3aac61b1352c99f SHA-256: deac87f42fc819433ebe70735d9923777b0920d8cf038879d983843e1ed078ae
126 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm hosted on disposable domains, suggests an attempt to direct users to malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=rohs+smart+watch PDF link annotation
    • http://xujilutobidiko.iblogger.org/48873296692.pdfIn PDF document text
    • http://puliliraforuwu.22web.org/new_bhakti_song_3gp_video.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_5fd306e7532e5.pdfIn PDF document text
    • http://nizozipup.22web.org/hymns_lds_sheet_music.pdfIn PDF document text
    • http://morasufas.iblogger.org/salt_peanuts_dizzy_gillespie_sheet_music.pdfIn PDF document text
    • https://vinixojaz.weebly.com/uploads/1/3/5/3/135312356/ef4900.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kewugozosefo.epizy.com/t_shirt_template_illustrator_blank.pdfIn PDF document text
    • http://gotenekopibijo.epizy.com/nier_city_ruins_piano_sheet.pdfIn PDF document text
    • http://bukarujinadir.epizy.com/men_s_footwear_size_guide_asos.pdfIn PDF document text
    • http://kunipotow.epizy.com/cottonwood_heights_police_reports.pdfIn PDF document text
    • http://kilaliwe.rf.gd/jeet_boss_movie.pdfIn PDF document text
    • http://fudotebu.epizy.com/16915839263.pdfIn PDF document text
    • http://peworesafasar.epizy.com/61269803476.pdfIn PDF document text
    • http://gipenebome.epizy.com/descargar_netflix_para_android_gratis.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_off0000d440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD440 5104 bytes
SHA-256: dc54c0e93a55e22d473a2836449c15b215cee6c9d607026afbcf331d948377c4
font_01_sfnt_off0000e583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 10580 bytes
SHA-256: c07ad93bf1341ec16864a34b7691175c3383827479ebcb0575f2d8cc8b5062b6

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