Malicious PDF — malware analysis report

Static analysis result for SHA-256 96902d4362d477eb…

MALICIOUS

PDF

77.4 KB Created: 2021-02-17 20:55:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1871c050878d8c1240de5f7d2efa7676 SHA-1: 7b66aabfee09272054f5a39a5f37280474111bba SHA-256: 96902d4362d477eb517ae99e23184f5d4f37b3342091b02d837f0d81e00513b3
186 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous external URLs, many hosted on disposable domains, designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate attempt to create a network of links for SEO manipulation or to host malicious payloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/strik?utm_term=places+that+give+you+free+dinner+on+your+birthday PDF link annotation
    • https://foguzutaporoma.weebly.com/uploads/1/3/5/3/135322660/c9c9c00.pdfIn PDF document text
    • https://fodubimofo.weebly.com/uploads/1/3/4/8/134884763/dfd7fc43f1389a.pdfIn PDF document text
    • http://bamimutekinawaz.22web.org/appelstroop_font_free.pdfIn PDF document text
    • https://bupulaserora.weebly.com/uploads/1/3/1/4/131437689/08ffb.pdfIn PDF document text
    • https://rixonusoraj.weebly.com/uploads/1/3/0/7/130738646/9493125.pdfIn PDF document text
    • https://kaxebovirufuj.weebly.com/uploads/1/3/4/3/134399635/4047997.pdfIn PDF document text
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/nokuxarafe_sakozovus_vapawaboxanosi_kibapug.pdfIn PDF document text
    • https://totovipuvo.weebly.com/uploads/1/3/2/7/132740708/zikomewujuboletis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvogixus.epizy.com/52487963412.pdfIn PDF document text
    • http://tesusaruva.epizy.com/camera_apps_2019_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/budget_and_forecast_template_excel.pdfIn PDF document text
    • http://rifovedukuj.epizy.com/nvidia_shield_4k_hdr_android_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/converting_decimals_to_fractions_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/odia_song_new_dj_2019_video.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_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 5588 bytes
SHA-256: ae571e6a026308465f1ba406d2b955e9bf5a51810aaed70cf1d804c024ad21bf
font_01_sfnt_off00010285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10285 11268 bytes
SHA-256: cd1fa8c23c206c506915ff96421bda9c0540539e347e8a66a3c676e8df940e60

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