Malicious PDF — malware analysis report

Static analysis result for SHA-256 37715f151de9e07c…

MALICIOUS

PDF

73.2 KB Created: 2021-04-05 14:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3e83fda83d687512c1d042b8d7aa13aa SHA-1: bc5b15253d98238f89fa993f07f81fd4f9eaa9cf SHA-256: 37715f151de9e07c96ef15a5523b35fd3ad792e2489e9e49fe7ba1b3aab72ee0
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. The presence of numerous external URIs, many pointing to disposable hosting and forming a link farm, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'sum and difference identities worksheet with answers pdf', likely a lure to disguise the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/wix?keyword=sum+and+difference+identities+worksheet+with+answers+pdf PDF link annotation
    • http://cosmicgig.com/zoom_g1_four_acoustic_patchyjyu7.pdfIn PDF document text
    • https://nunavataregexo.weebly.com/uploads/1/3/0/7/130775742/kolon.pdfIn PDF document text
    • https://lonomunemol.weebly.com/uploads/1/3/6/0/136082408/lusixige.pdfIn PDF document text
    • http://ceter.xyz/99952597641m4zr9.pdfIn PDF document text
    • https://dubitofux.weebly.com/uploads/1/3/4/4/134458445/1419a7328.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419847/normal_5fcbc28c4ed19.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/37954806500.pdfIn PDF document text
    • http://vovality.club/slots_games_for_pcz8oti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444386/normal_60011f1031b9f.pdfIn PDF document text
    • http://jobauthor.online/828036406600aui1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407807/normal_604e0749d23dc.pdfIn PDF document text
    • http://herss.space/cat_wart_removal5hofk.pdfIn PDF document text
    • http://tuderoba.getenjoyment.net/xafolafizelobijesujabigob.pdfIn PDF document text
    • http://nikibolerobika.getenjoyment.net/100_most_common_idioms.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fataragoreb.myartsonline.com/campaign_management_analytics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f64fcea9-922c-4c0d-bd96-897749442acb/58274076409.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/38240773321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/565df7c5-ecb4-42e2-98cd-f71aaa6e89e7/what_oil_does_a_2014_subaru_impreza_take.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/10067435163.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/mojoxiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1b5d72-2315-45e2-b295-40234e13492d/86059502946.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/80411635919.pdfIn PDF document text
    • http://laxolagodofomug.onlinewebshop.net/american_history_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd9beb2e-2cfc-4310-ba21-2f66f5586702/legabesesalotomixewi.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_off0000dd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 5620 bytes
SHA-256: e9887e500d11be65b80cea7ecd376fad889807853703bb955870aebe52ca2934
font_01_sfnt_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 11264 bytes
SHA-256: 9e0e290da39689bae17663f94b7ec732323aa67e0dd79897762219261d25e80f

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