Malicious PDF — malware analysis report

Static analysis result for SHA-256 6756a53060b20de5…

MALICIOUS

PDF

77.1 KB Created: 2021-02-26 10:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 23b072c6bf7183b6ca9e69f9f22fb139 SHA-1: dbe508891f74a5872bbda3f9bda162a6683db875 SHA-256: 6756a53060b20de5a10d51b9342a58e6520e5e50fe2d9b2ff33a1752e9c8b314
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=mamiya+rz67+for+sale+uk PDF link annotation
    • http://wejedakipitag.iblogger.org/32670250650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5fe9674d13158.pdfIn PDF document text
    • http://giveaway2020.info/musica_navideC3B1a_gratis5v81p.pdfIn PDF document text
    • http://presentinsta.online/kagefugi6t342.pdfIn PDF document text
    • https://larezonisu.weebly.com/uploads/1/3/0/7/130738889/2528627.pdfIn PDF document text
    • https://mokomowu.weebly.com/uploads/1/3/5/9/135969792/wediwaxujateguxafaw.pdfIn PDF document text
    • http://vibigalobonewil.iblogger.org/android_studio_app-_debug._apk_change_name.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/poletonutiwebediba362e.pdfIn PDF document text
    • http://shopsmmv.site/roger_a_arnold_economics_12th_editionk3vyk.pdfIn PDF document text
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/bexetisakuv_vemodewokibot.pdfIn PDF document text
    • http://forpost-electrica.ru/zonetatukubemogisupituobwt.pdfIn PDF document text
    • https://semulojera.weebly.com/uploads/1/3/2/6/132695334/0379dec.pdfIn PDF document text
    • http://onenature.space/7861037892463slc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376087/normal_5fc5985b6c3e8.pdfIn PDF document text
    • http://amst-watch-v1.club/dropwizard_maven_core7r14t.pdfIn PDF document text
    • http://azakalaza5.xyz/dragon_ball_z_fighting_games_apk2dbzj.pdfIn PDF document text
    • http://dreabling.online/ultimate_fishing_simulator_guide_android76ii8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuwutexo.onlinewebshop.net/ars_notoria_game.pdfIn PDF document text
    • http://gobozukelawi.epizy.com/telugu_movie_bewars_video_songs.pdfIn PDF document text
    • http://jobiduleger.epizy.com/aditya_birla_mutual_fund_factsheet.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_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 5368 bytes
SHA-256: c8fffd8d44502aa412d988cdfe43f43a276aee1d68e26885476dcc1a3d252099
font_01_sfnt_off00010217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 10972 bytes
SHA-256: 284dccff74bfb9fc6f079a7b20563947eba1e4b32161ca7c157631606c75942f

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