Malicious PDF — malware analysis report

Static analysis result for SHA-256 588b683fa1b23bcc…

MALICIOUS

PDF

85.7 KB Created: 2021-05-13 17:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2a1c7d98136bb108a3558d6e964fafa0 SHA-1: 12d8f42bb677474d842df9eee1dddcd044e9e210 SHA-256: 588b683fa1b23bccece790e8bab83aa8ae54f2fd907d43cacf46a118071c1a92
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and the overall structure point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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/strik?utm_term=what+does+444+stand+for PDF link annotation
    • https://tigobatimomovo.weebly.com/uploads/1/3/2/7/132740361/5ceb1e0.pdfIn PDF document text
    • https://gapurosudezejug.weebly.com/uploads/1/3/5/9/135965954/vegafuxonij_duxupodu_pexapomugo_damuki.pdfIn PDF document text
    • http://desokore.medianewsonline.com/antidiabetic_herbal_drugs.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/bootstrap_4_site_blueprints_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473023/normal_5fff62f7bdee9.pdfIn PDF document text
    • https://jumazege.weebly.com/uploads/1/3/1/6/131606101/xarup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446937/normal_5fdc1699b1873.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453327/normal_5fccc479d4244.pdfIn PDF document text
    • https://bumewotosebixab.weebly.com/uploads/1/3/5/2/135298585/xodologopujujenunudi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499309/normal_602ef87c5ba2f.pdfIn PDF document text
    • https://finoritibad.weebly.com/uploads/1/3/4/4/134468058/kazugurisovazo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jonapepubenej.epizy.com/csrss._exe_windows_10.pdfIn PDF document text
    • http://jipudovisubu.rf.gd/3840813475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5eafdc7-fda0-4f92-81f1-3ae46627591d/3329333686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/975bef90-5892-4f2f-9b83-f392f3522a86/niv_audio_bible_download_old_testament.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d8d3181-4dd6-4486-b1da-f61cae8d1d77/76130202894.pdfIn PDF document text
    • http://zusapogadakafa.rf.gd/red_cherry_shrimp_care_guide.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_8cbcc83e0b424317bd02f523677ec503.pdf?index=trueIn PDF document text
    • http://vabulepune.epizy.com/python_set_union_time_complexity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1238dbe2-ccb0-47c0-bfb4-2fd70568d69d/6261035400.pdfIn PDF document text
    • http://wororezijetixa.atwebpages.com/kupuxavidiwarumebijedizi.pdfIn PDF document text
    • http://rumajajoneder.rf.gd/78769689873.pdfIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_8aa46578b7b9491898cd4c0c7f0ca295.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/abdf1a60-cfd5-41a6-9a35-98b3e6a46b37/que_es_la_enseanza_segn_autores.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCB 4804 bytes
SHA-256: 782f87d4a0c31f049999c6c156114a32f102a997e2bd631dd37f1b24ea2b7358
font_01_sfnt_off00010c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C13 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000114a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A0 11296 bytes
SHA-256: 76f50422cc414eb7771b7d0781b93308f06098ae5879940c77976241aef31448
font_03_sfnt_off00013ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD5 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71