Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7663bf5824c8fc…

MALICIOUS

PDF

78.6 KB Created: 2021-03-15 00:13:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3d6818fcd16eb34d827ac869b2840533 SHA-1: ab182739d5ae964c605a4b64ac522491383a36fc SHA-256: bb7663bf5824c8fc48fb5345fd80d57ef884393cb6612390a3ed7c43d1cc5c01
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a domain associated with phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ponafet.ru/strik?utm_term=networking+interview+questions+and+answers+for+freshers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471273/normal_6044d9b4cf89e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367304/normal_5fcd90a36e75f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384048/normal_5ff54d6bbd5ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445573/normal_60153212c8ab7.pdfIn PDF document text
    • http://navoviragumaviw.22web.org/56248686147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490722/normal_6015a9963a726.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454432/normal_5fed59a312064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422620/normal_5fd780776de7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387811/normal_601f96ccad245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_60430401a7d0b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sakikuzugodo.rf.gd/burning_bright_full_movie_in_tamil.pdfIn PDF document text
    • http://pivipige.epizy.com/grade_5_math_measurement_worksheets_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc501d87-7f58-42b7-8f2a-a4066a6b4519/tavapufuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de6778b6-0181-4de6-a6f7-93d3a7380d90/how_to_take_permit_test_online_massachusetts.pdfIn PDF document text
    • http://zumepif.rf.gd/87789663113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0c42e83-2173-4704-bb2b-afd443613c30/marlin_336cs_review.pdfIn PDF document text
    • http://javuxanasojajex.epizy.com/kokidifekixijonapagireleg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ada8d61-497d-4b92-acb9-ca5517f32b88/16664625525.pdfIn PDF document text
    • http://tixinova.rf.gd/anti_ragging_form_by_student.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1bd5169-e229-449d-86af-7ad158436a59/what_is_the_role_of_a_christian_mother.pdfIn PDF document text
    • http://rutipozi.epizy.com/88766464751.pdfIn PDF document text
    • http://fefogisupiruro.rf.gd/weiser_smartcode_10_forgot_master_code.pdfIn PDF document text
    • http://vajowevub.epizy.com/97525288753.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_off0000f64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64C 5584 bytes
SHA-256: 787f10b95e7e0cdfdda7f67fef1b7e7ab62815c1e0665e157dce417cc7db507d
font_01_sfnt_off00010963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 10844 bytes
SHA-256: 23fb960b416de9b8f5c0a42209deca6402b2359d0e1164b893f535a8664e3787

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