Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3ca26169c3cb20…

MALICIOUS

PDF

76.4 KB Created: 2021-05-10 08:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4e7e87619a0bc0b395f80e00271a61fd SHA-1: dfb6e2b271c0e5715d95c4d85b7f98de4aba3205 SHA-256: ae3ca26169c3cb204bcf03dcb3504c8cf90f7966cd0f1fd8baacac61c00438d5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains or are part of a link farm strategy. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a large number of links for SEO purposes, which is often a precursor to distributing malware or phishing content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the PDF structure and embedded links suggest an intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/strik?utm_term=how+to+connect+acurite PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414494/normal_6050f52e07880.pdfIn PDF document text
    • http://azorocheat6.xyz/non_inventory_item_report_in_quickbooksa2dt7.pdfIn PDF document text
    • http://mirror-x.org/rebovezunelidulawum6xebc.pdfIn PDF document text
    • http://brosbass.com/3935724645126ywb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419820/normal_5fccbbe80da95.pdfIn PDF document text
    • http://copyrighthelpcentral.com/the_cloud_of_unknowing_chapter_summaryxy399.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390385/normal_5fcbbd2717ba6.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/probabilidad_y_estadistica_descriptiva2uuhr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_6044ec8d84731.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/minabiwa/guxoroxitufi.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/66444763720.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/satsuma_high_school_uniform_policy.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/caremark_medication_prior_auth_form.pdfIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_5e9bfd51211a478b81c70a1f9c0db048.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/toteluv.pdfIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_20b095622aae470cb8cc294d4ae55cfc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wozoxub/kufotumiboxibewoxiza.pdfIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_36fe0a429b9b4753adbe58844df859ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rebomedug/tavoseloterokibatipemiju.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/what_is_the_ending_in_the_book_defending_jacob.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/what_does_the_number_699_mean.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_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 4636 bytes
SHA-256: 960ce93453156abfa3acce0c520fc18b08b61de03cd0102b48bac291dbf15032
font_01_sfnt_off0000fe80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 11116 bytes
SHA-256: a46e089acb4de9aa4898d9d6c0cf85a48c849a99766807658a34e10102bb1c2e

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