Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2fd3384d2bf9e3…

MALICIOUS

PDF

82.2 KB Created: 2021-03-03 09:51:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 235db1a2fff817b6becb6ab6a556731c SHA-1: aaeb686e0485999cf64fa491d08c9e7027612eb9 SHA-256: dd2fd3384d2bf9e329bdabcf2708e83d8e813a2ec2ecb4a584e346e03d07d254
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content or malware downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wix?keyword=backstab+apk+rexdl PDF link annotation
    • http://topfrag.rip/73584932480wzkl0.pdfIn PDF document text
    • https://mojabizozawobe.weebly.com/uploads/1/3/4/6/134699592/nuvorokinad.pdfIn PDF document text
    • https://nebunabimumebu.weebly.com/uploads/1/3/4/4/134480995/518f1fadc4d7.pdfIn PDF document text
    • http://lemakomude.sportsontheweb.net/axe_fx_ii_xl_vs_helix.pdfIn PDF document text
    • https://nakotugobal.weebly.com/uploads/1/3/5/3/135300729/9601211.pdfIn PDF document text
    • http://tehnotop.store/roller_ballard_funeral_homexxha7.pdfIn PDF document text
    • http://help-service-support.com/wwe_fastlane_2019_results_bleacher_reportmqjj4.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/RJRgihc/plainfield_iowa_tractor_pull_2020.pdfIn PDF document text
    • http://straponartist.com/tesla_model_3_long_range_used_pricer11h8.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/43062713809.pdfIn PDF document text
    • https://bopovajo.weebly.com/uploads/1/3/5/9/135966354/1d0cef39e16.pdfIn PDF document text
    • http://fusekimutoxi.sportsontheweb.net/les_miserables_movie_trailer_2012.pdfIn PDF document text
    • http://covidcapsule.world/volavepituwapusukewoj0cgy.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/richard_iii_of_england.pdfIn PDF document text
    • http://blockhcain.host/leredepabedude6slal.pdfIn PDF document text
    • http://alifan.store/bts_kpop_songs_free_mp42zw1x.pdfIn PDF document text
    • http://giocodigital.website/schwinn_430_elliptical_trainer_manuald05cn.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/sjdNmGy/11211678668.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/tisegovofu/86202928344.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_off000106fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 5388 bytes
SHA-256: f33bd283e55e0880d39a7c0338ad3d75dfe680dffe3bd960e8a43b3b5d81f21c
font_01_sfnt_off0001195d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195D 10108 bytes
SHA-256: 2cb86836ee839cdbe1fd0b74a46ca2c82d0338c0238957b4aa506c51e9a014d2

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