Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3abe1eb8e9a2aa…

MALICIOUS

PDF

74.7 KB Created: 2021-05-13 22:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5447425de34df807808c3cb66f45dec1 SHA-1: 2a18b376c7bcff15b3a5831f199f6a087bc8177c SHA-256: ab3abe1eb8e9a2aa47b7ec42c2d606eeaad6eda0684c6aec08dae33b1a6ff854
166 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains multiple heuristics indicating suspicious external links, including invisible ones designed to redirect users to potentially malicious domains. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to phish or deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://dugedepap.ru/strik?utm_term=24+day+challenge+advocare+guide PDF link annotation
    • http://gogejevi.iblogger.org/sky_guide_tv_listings_ireland.pdfIn PDF document text
    • https://sujetobanep.weebly.com/uploads/1/3/5/3/135337497/josepuwasemaresetav.pdfIn PDF document text
    • https://dalideno.weebly.com/uploads/1/3/5/3/135384103/sazerafala-natumo-rigugadewob.pdfIn PDF document text
    • https://fogisavelubid.weebly.com/uploads/1/3/5/2/135299906/7b88df68c6.pdfIn PDF document text
    • http://alcexpress1.xyz/17952444323wltd2.pdfIn PDF document text
    • https://gatilesajegume.weebly.com/uploads/1/3/1/0/131070678/5456999.pdfIn PDF document text
    • https://zujododa.weebly.com/uploads/1/3/4/6/134652654/rulodudixofog_kozalij.pdfIn PDF document text
    • http://afracheat4.xyz/statistical_techniques_in_business_and_economics_17th_edition_answerszdk7z.pdfIn PDF document text
    • http://ultra0.space/solidworks_2020_tutorial_planchardlxw5f.pdfIn PDF document text
    • http://universal-kirov.ru/aggiornamenti_android_huawei_p9_lite4fzah.pdfIn PDF document text
    • http://com-login8.xyz/are_napa_wineries_open_during_covid-19mvgis.pdfIn PDF document text
    • https://nutomejeti.weebly.com/uploads/1/3/4/7/134702699/80b385f.pdfIn PDF document text
    • https://xaroduzorosu.weebly.com/uploads/1/3/1/3/131398324/da8f20c8f661cc.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/ad451a1a-a19f-4de4-aef2-63343ad88df9/the_walking_dead_book_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d483ce4-6f32-4b3b-b67a-4ea1fc87e1ba/taylor_ice_cream_machine_spare_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/673a4b42-1e9f-42c0-924d-01a83983971b/what_girl_names_mean_blessing.pdfIn PDF document text
    • http://kagejadel.epizy.com/bacterias_anaerobias_estrictas.pdfIn PDF document text
    • http://kagowuv.epizy.com/la_caida_del_muro_de_berlin_resumen.pdfIn PDF document text
    • http://suwuxuk.epizy.com/nilufetogubozakajijekopes.pdfIn PDF document text
    • http://nudewewupapu.epizy.com/ayurveda_books_in_malayalam.pdfIn PDF document text
    • http://wewodato.epizy.com/lopobinirozolinalifurelum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f8f2cbd-5028-4cd4-a996-a7ce4b9661c3/c_programing_structure_examples.pdfIn PDF document text
    • http://lozadubevapoke.epizy.com/lambeth_walk_sheet_music.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_off0000e73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 5312 bytes
SHA-256: b9cc785aa08ec837036bd649f1d3715dd10cda8f8a55093013a22495c31e5c99
font_01_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 10500 bytes
SHA-256: 6cec87f7b0f6705637971f40fbbddec16057101557679e4d0860206ab43993fc