Malicious PDF — malware analysis report

Static analysis result for SHA-256 7193842a28f0ea5e…

MALICIOUS

PDF

76.3 KB Created: 2021-04-03 12:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 78cb44f0ed6b64951f3a712b1c4efbe4 SHA-1: 7f1c90ed620aec2ef9f9c77cdaa1b6cf81bb509b SHA-256: 7193842a28f0ea5e2eecba30941ea9f7de611b9bda4f60309fa6af9b0c56faeb
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing lure designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/award?keyword=soal+bilangan+kuantum+pdf PDF link annotation
    • https://cdn.sqhk.co/minutakumu/iaggXWQ/70170499917.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/cfa_curriculum_changes_2018.pdfIn PDF document text
    • http://medyayazilimtr.com/8298099215tyrel.pdfIn PDF document text
    • http://meetchambre.xyz/sat_practice_test_10_answer_key7t53c.pdfIn PDF document text
    • http://vonoxafaku.scienceontheweb.net/arihant_ssc_stenographer_book_2020.pdfIn PDF document text
    • http://supusatode.sportsontheweb.net/active_directory_replication_step_by_step.pdfIn PDF document text
    • https://cdn.sqhk.co/xafileme/ihShdDr/revibisarakujerelibi.pdfIn PDF document text
    • http://abreudesigns.com/berekiboq7bfm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nodikisiti.rf.gd/80400694116.pdfIn PDF document text
    • http://woxutonugosafer.epizy.com/classification_report_in_machine_learning.pdfIn PDF document text
    • http://watafewajur.rf.gd/appear_sound_effect_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c134044-73e9-4211-8b80-dde9d6c6e900/25127315620.pdfIn PDF document text
    • http://toxifiv.myartsonline.com/prescott_and_dunn_s_industrial_microbiology_4th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc88769-bd73-486a-93bd-eab6d481488e/xuvob.pdfIn PDF document text
    • http://zajozikudesurek.epizy.com/nokese.pdfIn PDF document text
    • http://vilatelisoto.onlinewebshop.net/diccionario_strong_espanol_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cbc27df-442d-45ab-a451-4dab48f423a4/simple_maths_worksheets_for_grade_1.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_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 5392 bytes
SHA-256: 4cc32f131f6ecb0d82b004ecc74900ba72c5e3bb19185c00cbf25590fd9554ca
font_01_sfnt_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 11344 bytes
SHA-256: d85412a47cea798678272f684eee31cd9789679d1f41b1fe968f4411bbc0d99e

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