Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8b3f260f585572…

MALICIOUS

PDF

90.7 KB Created: 2021-06-01 00:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d27cb8c4b7e71001eacd07547c7f9085 SHA-1: 82795728e2ff17ca5d59ac54765111f163a782db SHA-256: ab8b3f260f5855727fc25aed3b599b26a05a4f7937e5a36af08d97cf2412c05b
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, one of which is on disposable hosting, suggests a link farm or phishing attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution vector, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bologen.ru/123?utm_term=narasimham+background+music+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365649/normal_6068d06f5d6ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_606d67d6d1eda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446264/normal_600ff22e96e62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478148/normal_6003adb18b89b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_6022eb0629dd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383304/normal_5fceb63f68ab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494883/normal_604957d13d30a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443372/normal_5ff3d42985cbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481985/normal_5ff62e1158d1e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144428139/javiwom.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/wodinawadunun.pdfIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/144425112/quantifying_energy_flow_in_an_ecosystem_worksheet_answers.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144418776/how_to_use_chromecast_with_bluetooth.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144428055/how_to_test_insulation_resistance_of_a_transformer.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/67978952431.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/f/ella_mai_songs_2019_mp3.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/break_even_analysis_numericals.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/67430409465.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/an_introduction_to_political_theory_latest_edition.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/cities_skylines_traffic_mods_download.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/f/lista_de_exercicios_multiplicao_e_diviso_com_numeros_inteiros.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144411618/45331797293.pdfIn PDF document text
    • http://wejojixi.pbworks.com/w/file/fetch/144423687/fidelity_net_benefits_phone_number.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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAD 5576 bytes
SHA-256: face0a570f17866e49c8d8077ac7f6b2dc267fe7f80927e8c515ec9edd573bb6
font_01_sfnt_off00011d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7B 5772 bytes
SHA-256: 3cef0ae050627c22d3bb05a30afc18c63eb7b48d474decfd9c7b8fe9b520ee94
font_02_sfnt_off00013275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13275 11924 bytes
SHA-256: e2be9f69e71a3db44f6eaf98f0b0b95e4a8079136a8834ca9f6515deda551c95