Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71e8f26b8fd6158…

MALICIOUS

PDF

88.5 KB Created: 2021-03-19 10:40:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: d00ccfc9a25604115306860221f02f4f SHA-1: ef0c4d01640018916a4af17caeb5b1816caca7d3 SHA-256: b71e8f26b8fd6158cbe30cdeffab1407d8713451225151e8a88bd235c455d68c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable or unknown hosting services, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/award?keyword=ipad+pdf+annotation+app PDF link annotation
    • http://desokore.medianewsonline.com/golds_gym_xrs_20_olympic_workout_bench_exercise_chart.pdfIn PDF document text
    • https://kexipana.weebly.com/uploads/1/3/2/7/132740250/8633002.pdfIn PDF document text
    • http://rixadixiji.scienceontheweb.net/91994355947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412757/normal_600dba2e236a8.pdfIn PDF document text
    • http://yoga-italy.space/american_history_quizlet60ntp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450041/normal_5fe4fcbe01eac.pdfIn PDF document text
    • http://piwifeg.22web.org/6478555154.pdfIn PDF document text
    • http://probkin34.xyz/xerizefivan6h5rm.pdfIn PDF document text
    • https://naxufubiromu.weebly.com/uploads/1/3/0/7/130738890/1820273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415944/normal_603d7bed68876.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417129/normal_5fc914e990852.pdfIn PDF document text
    • https://bovopoboj.weebly.com/uploads/1/3/0/7/130776351/popiw.pdfIn PDF document text
    • http://jakor.pro/12293215167uizhv.pdfIn PDF document text
    • https://gisogademumes.weebly.com/uploads/1/3/1/3/131379615/9572759.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/gugijulolapo.pdfIn PDF document text
    • http://virona.org/fupozegulobulikavu2b98p.pdfIn PDF document text
    • http://doporujela.iblogger.org/benazir_bhutto_song_pagalworld.pdfIn PDF document text
    • http://nezowigivomi.scienceontheweb.net/zapujibikujojux.pdfIn PDF document text
    • http://graatorama.space/5163495808punra.pdfIn PDF document text
    • https://xadigepuve.weebly.com/uploads/1/3/1/4/131454317/dalerefiluwo_nutoped_siferi_fetubug.pdfIn PDF document text
    • http://vivudanu.scienceontheweb.net/87130629555.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bobosuvediv.epizy.com/does_steam_while_playing_another_game.pdfIn PDF document text
    • http://bitokirapaxeg.rf.gd/43551634605.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 4668 bytes
SHA-256: 7d24b1c93fd7e2ff5981840449ddcfc94b2a772d278fa63a7205951423e1d16e
font_01_sfnt_off000112da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DA 12208 bytes
SHA-256: 6a981cc85d0fb844ebc841a8481c7663f5f0bd4be8f65b55d2de725c8789a2d3
font_02_sfnt_off00013c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C35 16404 bytes
SHA-256: 30bf5ef78487f1e6c4bc190f026b77c616bf625ddc8e468a467aebd31177a3b7

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