Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a35afa5970c4064…

MALICIOUS

PDF

73.8 KB Created: 2021-03-02 06:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 543a10ef314d34905c4a5795f4ad975e SHA-1: a8dcbde9f9dc624fb2ba65ca6c8eedc52772ba12 SHA-256: 4a35afa5970c4064e15d0e58ca4cb1a6ceec4ceac33d0c5fa7b3153e1e8be699
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious phishing content. It contains an external URI and an image lure that redirects to a suspicious URL, indicating an attempt to trick users into visiting a potentially harmful site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/strik?utm_term=what+are+unique+characteristics+of+christianity PDF link annotation
    • http://retilokufiz.22web.org/how_do_i_reset_my_honeywell_thermostat_to_factory_settings.pdfIn PDF document text
    • http://maxefeb.iblogger.org/52543822838.pdfIn PDF document text
    • http://tuzogat.sportsontheweb.net/singer_stylist_534_needles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413007/normal_6017127b81c3f.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/ruxisedezimaxovujalen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482189/normal_60260a2c17170.pdfIn PDF document text
    • http://zinobinipote.22web.org/fegisafameza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wotonopeg.epizy.com/23482115610.pdfIn PDF document text
    • http://posidepixofonep.epizy.com/85152460685.pdfIn PDF document text
    • http://vupaguriwedizid.atwebpages.com/lelutifuni.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/ease_of_doing_business_2018_india_report.pdfIn PDF document text
    • http://naperopumo.rf.gd/download_adobe_premiere_pro_cc_2020_windows_8.pdfIn PDF document text
    • http://nojekakanafigi.rf.gd/28372521232.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/lofoviset.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/ios_13_beta_5_ipsw_link.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/favifusexexef.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/igcse_maths_questions_with_answers.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_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 5180 bytes
SHA-256: 6cf6f74a9875ea6b349131554478100d9152393247909cc14d0cfdcf142d4d35
font_01_sfnt_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 10148 bytes
SHA-256: bce5c97cacd4fb2be10cc218b8826810b0c417ae39a3fbfedbcdc0f7aea494ad

Open this report in the interactive analyzer, or submit your own file for analysis.