Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79ac24e5e8e309f…

MALICIOUS

PDF

101.0 KB Created: 2021-03-15 15:22:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: fb0b3cf7944ef865cc1e541eed71a6a8 SHA-1: c684ce777749ad0552b93560608e54140471cfcd SHA-256: b79ac24e5e8e309f7736553e338849b4c221dde81b6614bc60325ab31d182337
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, many of which point to disposable hosting and are designed as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to file downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/award?keyword=spoken+english+pdf+file+download PDF link annotation
    • http://xepewifub.mygamesonline.org/ielts_academic_vocabulary_exercises.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446649/normal_60312c6c02d95.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/the_chronicles_of_narnia_full_movie_online_watch.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/active_and_passive_voice_definition.pdfIn PDF document text
    • http://tidirakozodawon.getenjoyment.net/d-link_dsl-2750u_software_update_download.pdfIn PDF document text
    • https://bovidekomuburo.weebly.com/uploads/1/3/5/3/135312485/gapumemusudugezoxil.pdfIn PDF document text
    • https://fafafavavilaba.weebly.com/uploads/1/3/4/8/134893162/mewunajojuguvon-muxibe-xekejibezol.pdfIn PDF document text
    • http://tepoparupomo.medianewsonline.com/7128879258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477630/normal_6009bdf933a0f.pdfIn PDF document text
    • http://foruzakitotilut.iblogger.org/wifunozometawosab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392218/normal_5ff64c83a6774.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_01e01d82b2cf46a9a5573282e2e25efc.pdf?index=trueIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_a13644d9dff7445e9cf17856c561a180.pdf?index=trueIn PDF document text
    • http://dodozos.epizy.com/fimuzuzutipajafo.pdfIn PDF document text
    • http://pagupim.epizy.com/fumifujakobixigubupazosu.pdfIn PDF document text
    • http://zevovalik.epizy.com/coast_guard_height_weight_standards.pdfIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_3c541a137c834a49b042fc5f8c8ffbf3.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3B 5468 bytes
SHA-256: 524adbb44b4daba43f5aa3afc77097d3a25c6a399595d9f7679375060c3e35a1
font_01_sfnt_off000120ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EA 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off00012c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4D 11316 bytes
SHA-256: 803bc299ca25b314c4cabbc3e174b22af4103fad9dbabf9536fd78a3c5dd006a
font_03_sfnt_off00015279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15279 17180 bytes
SHA-256: b3e09e67c362fa725060a0895f41325b77cc1c61cb75cc1996444671412f51f0

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