Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ab620586685790…

MALICIOUS

PDF

77.5 KB Created: 2021-03-06 04:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 11e7b343aff2c0946b348b3f68416523 SHA-1: d8b71deea8b92bbfc79cc6f961ac080ced0df212 SHA-256: a5ab620586685790d85f0e60e063cf869bf0939334f4294865f74368c7beb776
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or unknown domains, suggesting a link farm or phishing lure. The presence of external URIs and the ML classification strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/wix?keyword=balancing+word+equations+answers PDF link annotation
    • http://normal-id.com/evolucin_histrica_de_los_subgnero7xur1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495843/normal_60098f247146b.pdfIn PDF document text
    • http://my-favshopc.online/football_manager_2017_wonderkids_shortlistgdi5j.pdfIn PDF document text
    • http://comp-arenda.site/boyhood_movies_spdftp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385214/normal_601e353c1ef1c.pdfIn PDF document text
    • http://palitra-cveta.ru/husqvarna_372xp_price_canadau0heb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463825/normal_5fe22b096b89b.pdfIn PDF document text
    • http://ibkreactiva2020.com/officejet_pro_8600_plus_drivert3siw.pdfIn PDF document text
    • http://vanlit.ru/bilif5y7f2.pdfIn PDF document text
    • http://hackins.site/reforma_y_contrarreforma_resumenr4wmm.pdfIn PDF document text
    • http://yesitalia.fun/megudowonikesoxonyn16k.pdfIn PDF document text
    • http://rotixumuzu.22web.org/girefawalegilefodaxomute.pdfIn PDF document text
    • http://dezirer.iblogger.org/snap_on_3_8_torque_wrench_for_sale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_eff5e33f8c66475091afedd176b7899c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/db6556a4-bc0b-48e1-b42e-27f963236411/75872910050.pdfIn PDF document text
    • http://wadekazu.epizy.com/banished_colonial_charter_journey_1._71.pdfIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_cac854c2d60f4e54a4b68691246278fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b23811e7-26a8-49e6-b11d-3f3ff13064db/29175292119.pdfIn PDF document text
    • http://girogabunuxumu.rf.gd/borland_delphi_5_enterprise_free.pdfIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_f9743b25897b4a948366f9607c250f88.pdf?index=trueIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_4b68ecdb7e4a4823b44811493cb2c498.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb4dcfd9-ea8d-448f-9bbc-6babdac5ddb2/36736366260.pdfIn PDF document text
    • http://jusolasoxo.epizy.com/33477292444.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_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 5372 bytes
SHA-256: c08468c748ec04e92026e87f43266caa78c911015515b24110e1e10694b4676b
font_01_sfnt_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 10304 bytes
SHA-256: e99598f80b99a816fb124c0e0004d1e121f9adbe35542d2d056bb1d1406d2e01

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