Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9ab9d2df509877…

MALICIOUS

PDF

77.7 KB Created: 2021-03-04 23:03:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bb74d0e24030dd043fffcd6a56cd68e1 SHA-1: 39302e2c85096cc37f957e3cac9f724049dbaa06 SHA-256: bc9ab9d2df5098777f997c759b454ce8f6cda3fbaf7831938bde8d11f7b082ef
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one, 'https://ponafet.ru/strik?utm_term=nursing+research+generating+and+assessing+evidence+for+nursing+practice+11th+edition+pdf', appearing to be a phishing lure. The PDF also utilizes a link farm on disposable hosting, suggesting an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/strik?utm_term=nursing+research+generating+and+assessing+evidence+for+nursing+practice+11th+edition+pdf PDF link annotation
    • http://iuts.space/22683146062kxeof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445119/normal_601e01c7e3985.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/sat_essay_and_subject_tests_cancelled.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385021/normal_60217b745bace.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485436/normal_5fffe46884d1f.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/14509096610.pdfIn PDF document text
    • http://tagarubame.22web.org/the_gospel_centered_life_participants_guide.pdfIn PDF document text
    • http://bomepufibawil.scienceontheweb.net/baudrillard_simulacra_and_simulation_book.pdfIn PDF document text
    • http://simcars.ru/zupogunobozilibuxubik8e1m.pdfIn PDF document text
    • http://comp-arenda.site/98785663592xc2g6.pdfIn PDF document text
    • http://wide-do.top/wopilarefepeobu4o.pdfIn PDF document text
    • http://boomua.site/clash_of_clans_hack_app_iosa68ku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7769244e-05ed-4b13-8967-6e1277480543/english_vocabulary_in_use_upper-intermediate_book_with_answers.pdfIn PDF document text
    • http://jujageritoxo.atwebpages.com/wemo_maker_factory_reset.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/ford_mustang_mach_1_for_sale_florida.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/walt_disney_world_parks_calendar_2021.pdfIn PDF document text
    • http://losisotudek.epizy.com/83877632259.pdfIn PDF document text
    • http://sovogezo.atwebpages.com/how_to_connect_canon_mg3520.pdfIn PDF document text
    • http://xefivaz.epizy.com/samavitagud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/725d8dfd-9061-448f-b535-6ba59e40191e/32675761532.pdfIn PDF document text
    • http://wonegesaf.epizy.com/68372379493.pdfIn PDF document text
    • http://tujijekaxevon.rf.gd/52597014993.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_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 5464 bytes
SHA-256: 05b164eff9ef9d16636526528c94e5789c7cd615701be115f0f6b34f49e2fb38
font_01_sfnt_off00010258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 11088 bytes
SHA-256: de628d0c47268ac97453343fe27f596422b19c727e9804903a044ed0b17671bd

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