Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87fd3ce50fbc036…

MALICIOUS

PDF

75.4 KB Created: 2021-03-21 06:38:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a30d546a2e795a0d6d4fd2e13113e89f SHA-1: 234276916eeb7e290c9b4d815d9d7c969495fe70 SHA-256: b87fd3ce50fbc036f138c1b8b624a1f4174a4489b52b926f29f93bbcde450c44
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

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 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://zajinet.ru/wix?keyword=wall+bed+plans+pdf PDF link annotation
    • http://fepemewavitik.66ghz.com/34808507713.pdfIn PDF document text
    • https://dexanobibe.weebly.com/uploads/1/3/5/2/135299911/5762986.pdfIn PDF document text
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/f4badffdb4d2ab.pdfIn PDF document text
    • http://vemiwegar.iblogger.org/what_is_the_fastest_fios_speed.pdfIn PDF document text
    • http://zovibunuxesemer.iblogger.org/syllabication_rules_in_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wosakev.epizy.com/semicolons_and_colons_worksheet.pdfIn PDF document text
    • http://fukefuxatolu.epizy.com/bosegirovadutawodovuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c687e22-e286-4b5c-975b-e148ee3ec193/ruwex.pdfIn PDF document text
    • http://diwedowa.rf.gd/3512707664.pdfIn PDF document text
    • http://benijumenulizu.rf.gd/data_communication_and_networking_free_download_tutorialspoint.pdfIn PDF document text
    • http://puzazusor.rf.gd/body_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e43c0398-3a6a-4e6f-9b31-14d790ec5c32/which_rat_had_the_fastest_metabolic_rate.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/nikon_d850_dslr_fx-_format_camera.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/walmart_annual_report_2005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a520c82b-4c4f-436b-bf64-8a49336dfb56/rikoberabozatuxabeda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f3e40d8-009b-42cf-a055-a2c3df88867d/83306402316.pdfIn PDF document text
    • http://nizamazibenu.rf.gd/godigitibatamaguxevidu.pdfIn PDF document text
    • http://sakupoje.epizy.com/nukire.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/good_food_review_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2de74e7-79b0-47f7-b9c8-bee0fd7cd330/45918634534.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_off0000e9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FC 5092 bytes
SHA-256: 224983a4ff15a3bd5c01ef0819d67c08452514ceef53c7e1b444310a0be8c2c3
font_01_sfnt_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 10900 bytes
SHA-256: c8da5db791d8bbfd0625907fc745d9fcfef9e71c6ebb4e858f925f7b5f829f06

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