Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1b921d35bfe7fe…

MALICIOUS

PDF

85.3 KB Created: 2021-03-04 23:13:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b1ce617d49e3bfa7768e1b63a282edaf SHA-1: b5cd93d746ce226de4cd6fbaeb3e6b1ecf70c97d SHA-256: 6e1b921d35bfe7fe9d0b1becba634b4589a25bf4b78165e2683414c22e3504ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a notable heuristic identifying it as a link farm on disposable hosting. The presence of external URIs and the overall structure suggest an attempt to redirect users to potentially harmful content or facilitate further infection vectors.

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 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://fokemale.ru/123?utm_term=nyssma+piano+level+2+requirements PDF link annotation
    • http://suziterunedoloj.sportsontheweb.net/what_punctuated_equilibrium_mean.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453100/normal_600f821e90ebf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392656/normal_5fcd8d181bcf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412408/normal_60242a1982fa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488809/normal_6033789a817c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367312/normal_5ff00dfa3b058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455374/normal_60364cb421e3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369304/normal_5feb276973ff9.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/remogalesebebefatanifefuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_6015713890d35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413113/normal_5fdf035e9b527.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496005/normal_5ff8718ddaf31.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/babeviraxim.pdfIn PDF document text
    • http://topepuxabi.iblogger.org/aplikasi_story_saver_wa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464302/normal_5fe5ab6a678b3.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/jojitagifuva/the_road_within_movie_on_netflix.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/1053093423.pdfIn PDF document text
    • http://bidovug.rf.gd/rca_dvd_home_theater_system_with_hdmi_1080p_output_manual.pdfIn PDF document text
    • http://wadekazu.epizy.com/kennewick_weather_report.pdfIn PDF document text
    • http://zaxilofekuji.epizy.com/motatutazenuwexalijazi.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/sat_prep_khan_academy_login.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/zizubovirevu.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/74551290880.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_off0001036a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036A 5356 bytes
SHA-256: dc3c3d387436026c7a9f19572bab5a6ad010c7e3cf49557a9b93bec1692ca934
font_01_sfnt_off0001159e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159E 16292 bytes
SHA-256: 34579d583e56e4d4d5596fb4affe5bdf395011579884f1c8ea77c6f41ec60346

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