Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4fb131e7a10153…

MALICIOUS

PDF

75.4 KB Created: 2021-03-12 08:28:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9cebbeceabec1d0d06df9afcacbd8a72 SHA-1: f9c29ae378544773df3a9716302b9afee71e41a3 SHA-256: 2b4fb131e7a10153a536d40482a4a454b78c130fc300b46d8383e1fb17221e0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to a disposable hosting domain, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the lure-based attack pattern.

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://druttle.ru/123?utm_term=base+de+datos+ejemplos+informatica PDF link annotation
    • http://gatorama.fun/wofaxedinumkg1pz.pdfIn PDF document text
    • http://kvrovk.xyz/zitojutilisavukovosiwxi05t.pdfIn PDF document text
    • http://harmony-market.ru/5210003618ag3di.pdfIn PDF document text
    • http://shtampshop.ru/the_innovators_dilemma_epub4cvyc.pdfIn PDF document text
    • http://markettop.pro/instagram_image_full_sizewwm12.pdfIn PDF document text
    • http://world-wild-shop.com/calgary_barbell_16_week_program_spreadsheetv97si.pdfIn PDF document text
    • http://mavito.online/jolly_grammar_pupil_book_11xwil.pdfIn PDF document text
    • http://dfwshootersupply.com/pepibujibejawitafilawil4tgn.pdfIn PDF document text
    • http://yewes.space/where_did_the_aa_slogans_come_from58b0l.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/3dc3458b-9cf5-447b-9f97-6c30c8f9f9ce/saitek_x52_elite_dangerous_profile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eac1b6e-747e-4ef4-ad5f-5622486ee9af/fajadijoziwifepom.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/6478155338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2093dae-7b2e-430a-aabb-381e00bdc7e8/what_is_an_example_of_a_quasi_experimental_design.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/dungeon_master_s_guide_1st_edition.pdfIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_1181893afc3246a58bf58ee546519af4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ed7e41e-0a68-4551-b375-ae219d07425c/members_mark_commercial_oven_grill_and_fryer_cleaner_by_ecolab_sds.pdfIn PDF document text
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_9888f3e5ec7c48c6adb6ffef4c954f76.pdf?index=trueIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_42fdd0bd287c43b0b6e221b204e2f65e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woneketelak/xamasobazemufusenodibevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f7317a-3790-428b-9f83-4c99e86d750d/16381998665.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://www.um.es/docencia/barzana/IAGP/IAGP.htmlIn 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_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 5428 bytes
SHA-256: db42f80ce7ce6eae61fd6b94ea57f400efdfae0a4375343fbbe16e2c53749dbd
font_01_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 11344 bytes
SHA-256: a538fe2e294290bf9a82d3ea5ef1f5902748d527c59cd64e7d3b286b83b66546

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