Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e71c8889fd52bcd…

MALICIOUS

PDF

73.3 KB Created: 2021-03-02 14:52:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 00b502b6ea630aa5de1084a0a71c8d5f SHA-1: b35762c603d031c4114e704afab230e19c25adc6 SHA-256: 6e71c8889fd52bcd33ce960ac4aae1d5b1210c874a88d02daeb3320e30e20e19
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable hosting, suggests a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution campaigns.

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://golowaki.ru/wix?keyword=the+giver+vocabulary+chapter+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446490/normal_600b21ca89a36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421776/normal_5ffd2987a72b2.pdfIn PDF document text
    • http://retamos.mygamesonline.org/how_to_interact_with_nonverbal_autistic_child.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/13489420198.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/nodigunag.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/64653191383.pdfIn PDF document text
    • http://terugate.mypressonline.com/pasegerajavuveg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jizonizop.rf.gd/all_season_tire_performance_comparison.pdfIn PDF document text
    • http://litorow.myartsonline.com/riguxuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/aggregate_soundness_test.pdfIn PDF document text
    • http://bowupezik.epizy.com/blichmann_boilermaker_g1_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/apj_abdul_kalam_books_online_reading_in_tamil.pdfIn PDF document text
    • http://punexowimuseva.epizy.com/bink_sake_piano_sheet.pdfIn PDF document text
    • http://bebovufuvuji.myartsonline.com/tutorialspoint_asp.net_core.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/robert_adams_prints_for_sale.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_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 5320 bytes
SHA-256: ada72994f98c02e95af38d75af0111996fd270035ce4d9dd0f1fcc71bebde2b9
font_01_sfnt_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 11792 bytes
SHA-256: d362aa8bb7b8d610c5698734384d62ba7df00157e7a1a416a06c990907f5b8bd

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