Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2a52bdca50f40d…

MALICIOUS

PDF

100.2 KB Created: 2021-03-02 18:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 161e774e5f4bc4a5321d10fb41aeafd8 SHA-1: 44c4c496dac0e78b5d4d9a10eebf8615e54c3873 SHA-256: 8a2a52bdca50f40d45bfb16f30594376637b8068383fd10ad266eb98e495f373
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains text related to search queries and application metadata, indicating a deceptive lure.

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://baarspo.ru/strik?utm_term=what+are+the+most+popular+idioms PDF link annotation
    • https://cdn.sqhk.co/lotidonita/hgYhiHy/green_bay_packers_depth_chart_2018.pdfIn PDF document text
    • http://itdiscount.info/hindi_english_bilingual_visual_dictionarycukpk.pdfIn PDF document text
    • http://znakomstva69.space/fundamentals_of_heat_and_mass_transfer_incropera_7th_edition_solutions_manualvxkev.pdfIn PDF document text
    • https://cdn.sqhk.co/kogujipubap/he3TmSW/24139600159.pdfIn PDF document text
    • http://zesamoa.online/pomelewamf14z2.pdfIn PDF document text
    • http://instacopyrightcenter.com/gifaritisulislu94.pdfIn PDF document text
    • http://salonapp.xyz/thug_kitchen_cookbook_recipe_list0cmpd.pdfIn PDF document text
    • http://gallery-shop.site/pokemon_roms_light_platinumx869a.pdfIn PDF document text
    • http://accface.in/osmosis_and_diffusion_review_sheet228i9.pdfIn PDF document text
    • https://cdn.sqhk.co/kapimetavis/ChjFLih/16593181032.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/dexodekelaseki/91822197760.pdfIn PDF document text
    • http://xulezudo.epizy.com/rutad.pdfIn PDF document text
    • http://xanunomoz.rf.gd/rijuwokobedutinedajez.pdfIn PDF document text
    • http://godemesefiw.epizy.com/past_tenses_advanced_exercises.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/oracion_para_la_corona_de_adviento_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/kindred_credit_union_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/fedafa.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/ligawusulu.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_off00014d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D00 5212 bytes
SHA-256: 520800a836e908898e1395356f8b7282c99928e92e44d84deba04829e8e5dab8
font_01_sfnt_off00015e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E98 10860 bytes
SHA-256: 4ff0fde8b2b0978dd3bc98c992103f944fe9847e1bede65b20cd1ebbfb013568

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