Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a4c4aaf31bf9ab…

MALICIOUS

PDF

79.4 KB Created: 2021-03-31 02:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ff7e5550351d615894f4967716bf2a65 SHA-1: 07e29445e28bcf0ebbc5e58f8087a79d82f3422c SHA-256: a3a4c4aaf31bf9ab51efaeafa080c4300e888d4bc23badab68537207bc4767ca
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a phishing or link-farming scheme. The presence of a 'utm_term' parameter in one of the URLs suggests an attempt to track user engagement with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/123?utm_term=manhunt+unabomber+netflix+parents+guide PDF link annotation
    • http://wugumonisukanib.sportsontheweb.net/waterloo_sunset_chords.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/zebinivinanuvufaf.pdfIn PDF document text
    • https://gunesuzupe.weebly.com/uploads/1/3/4/6/134679160/fudolago_luzegoze_muxapo.pdfIn PDF document text
    • http://nakijeku.mygamesonline.org/katikowu.pdfIn PDF document text
    • https://nakoliveb.weebly.com/uploads/1/3/4/5/134503524/fbc95d9515.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412151/normal_6004f855f0c7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_604d0a36d3f41.pdfIn PDF document text
    • https://nijumaweka.weebly.com/uploads/1/3/1/3/131379182/9904d.pdfIn PDF document text
    • http://dujaliz.iblogger.org/endometrial_hyperplasia_rcog_guideline.pdfIn PDF document text
    • http://vajogeboru.iblogger.org/nalopesasofitofajosamal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vutakeba.epizy.com/58495074447.pdfIn PDF document text
    • http://xuvuzonixo.onlinewebshop.net/star_wars_books_canon_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3156f8b-cdb6-46c7-b037-08f2861b1a61/vans_old_skool_platform_black_junior.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fa87c2b-bb5d-4531-abe2-87f7f3cfa6f3/why_is_penelope_important_in_the_odyssey.pdfIn PDF document text
    • http://xugidujesu.epizy.com/bafus.pdfIn PDF document text
    • http://mupumirupuwanaf.epizy.com/44772386292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60f6355a-4fe7-4514-8a79-98181637323d/73573406518.pdfIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_e14002ac0dfe46809bb26f8e6627000b.pdf?index=trueIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_7fc2171f1fa147d38ab6d7a3b9f112a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b744eff-b7ff-4bfe-93ea-0a2a9f523e91/22785285012.pdfIn PDF document text
    • http://kawerulim.onlinewebshop.net/descargar_libro_fisica_2_bachillerato_santillana.pdfIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_5d7803958bb74d7582c5e062db92b9f3.pdf?index=trueIn 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_off0000f616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 5668 bytes
SHA-256: efd517946147317e4e96b7f3a04bd2463f97f0745e88c5c210d2997f185c4e0f
font_01_sfnt_off0001093f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 10752 bytes
SHA-256: c780ff5c12474bbfc825dd74a5cfc46204df6fd08c647e88cc553fe345976295

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