Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb92640c699da26e…

MALICIOUS

PDF

65.3 KB Created: 2021-02-12 09:15:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8ba490147ca4b269d57cfef2d454984f SHA-1: 55ece22a00da33b8b065b15d007116762362775a SHA-256: bb92640c699da26e6860e7294605c0dbe99c9368a1e5e18b43b431293cc64ac6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a tactic to redirect users to potentially harmful sites. The presence of embedded URLs and the nature of the heuristics indicate a malicious intent to exploit user interaction, likely through a phishing or credential harvesting scheme.

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://leonvi.ru/wix?keyword=ikea+galant+desk+price PDF link annotation
    • http://visezuxopusifik.iblogger.org/pibirubu.pdfIn PDF document text
    • http://gorerusuwoto.iblogger.org/sokokenenutekipipoleg.pdfIn PDF document text
    • http://sunepoxuvigos.66ghz.com/nha_ccma_exam_study_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/hwge0if/xidodonudanogevovogazi.pdfIn PDF document text
    • https://cdn.sqhk.co/rabovafom/jfidvia/first_strike_valorant_date.pdfIn PDF document text
    • https://rodironamo.weebly.com/uploads/1/3/5/3/135347674/sanowevakixi-pidevomo-sinojabutodom-lawajigire.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464873/normal_5fff25a509097.pdfIn PDF document text
    • https://vevumugenewasu.weebly.com/uploads/1/3/0/7/130776279/pepowo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366358/normal_6003941ac90f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5fd8fc116079f.pdfIn PDF document text
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/nepote_baxavijufaj_ralozenefapasa_jusunuvano.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bafasoronejero.epizy.com/lagu_ost_cinta_karena_cinta_uyeshare.pdfIn PDF document text
    • http://kubudafexajik.rf.gd/57268769399.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/cracked_android_games_apps.pdfIn PDF document text
    • http://figofubinodafe.rf.gd/comic_collector_guide.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_off0000c250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC250 5240 bytes
SHA-256: 80a4705fe4c085e2923622edc135857997c86d85ec46c5d16809e2ccbf2a06a2
font_01_sfnt_off0000d43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43B 10680 bytes
SHA-256: 74aa1fa2fbf3c7f5870985a2971420e81ffe067f54e0b8b3bf4976cf8cecf9a1

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