Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee451ecd8935e34…

MALICIOUS

PDF

79.5 KB Created: 2021-02-27 03:39:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7dff100e0da0137b88aa5f230a969e4a SHA-1: f7549a3e8f4df97555a4ed73a55860beae91afb5 SHA-256: 4ee451ecd8935e34f4719135a94b72b02905ccc80ea8e804d296fff8f11ce9dc
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a deceptive lure related to a book summary, designed to trick users into visiting malicious URLs.

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://ponafet.ru/award?keyword=the+shakespeare+stealer+chapter+14+summary PDF link annotation
    • http://tigimurudel.22web.org/hub_shoes_size_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477615/normal_5ffd7ff4d640e.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/what_are_the_natural_sources_of_atmospheric_carbon_dioxide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_6030cd31dad2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450426/normal_5fd091369e73a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405195/normal_5fc622291ff63.pdfIn PDF document text
    • http://jiwitoletazadag.iblogger.org/league_one_table_form_guide.pdfIn PDF document text
    • http://cenderaoriginator.com/dyson_ball_animal_2_part_number2rs3m.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/pomuxefitupipa.pdfIn PDF document text
    • http://maska-respirator.shop/browsing_definitionubhw7.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/korula.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pobiludorigogok.epizy.com/katazabib.pdfIn PDF document text
    • http://bepenopivite.epizy.com/jabadakijanowanifugujir.pdfIn PDF document text
    • http://budezeja.rf.gd/56950954713.pdfIn PDF document text
    • http://joxepivebafugig.epizy.com/49620960213.pdfIn PDF document text
    • http://xakosafejel.epizy.com/filematixudun.pdfIn PDF document text
    • http://pofiron.rf.gd/ridaguposase.pdfIn PDF document text
    • http://liforese.epizy.com/aplikasi_bobol_wifi_id_apk.pdfIn PDF document text
    • http://dodarululi.epizy.com/apologize_letter_formal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 5048 bytes
SHA-256: 807d0a228a5441e6b0495bf47f9a8a57bf964def386389cadc0e4ec606345e54
font_01_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 9936 bytes
SHA-256: b7a5e9d9a4c1a3b75784b5831faa120caa54d38f6d80c51b5fa7957f6059e89e
font_02_sfnt_off000121f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F7 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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