Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0584c8858fc6eaa…

MALICIOUS

PDF

76.5 KB Created: 2021-04-25 21:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 576e3cf9cf1f324dbd0051ab5eac14de SHA-1: fe3458fae67860dbeaff32c62d00a17a976c8786 SHA-256: e0584c8858fc6eaaba01ab5010a32cb1edfabc56193dbde4169134bacaa8d4a9
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to playing a djembe drum, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=how+to+play+the+african+djembe+drum PDF link annotation
    • http://shopmzm.site/viruluxorx4rb.pdfIn PDF document text
    • http://sesalon.xyz/hamlet_act_1_scene_2_soliloquy_analysisx6fmp.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/how_to_paint_a_room_with_a_chair_rail.pdfIn PDF document text
    • http://suvonenexazu.mywebcommunity.org/leritikopusav.pdfIn PDF document text
    • http://fidekeleko.medianewsonline.com/isaac_albeniz_cordoba_guitar.pdfIn PDF document text
    • http://it50save.info/tips_gold_for_koala_challengerlwif.pdfIn PDF document text
    • http://serawuv.mygamesonline.org/tecnologia_4._0_atlas.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/32075136962.pdfIn PDF document text
    • http://kismykeitio.best/krte_mevlid_szlerijp7so.pdfIn PDF document text
    • http://springtea.space/burezatiziduwumisir6w5b.pdfIn PDF document text
    • http://vizenam.medianewsonline.com/lorunonosadipevafije.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wokidomogu.onlinewebshop.net/ielts_writing_task_1_sample_answers_band_9.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/how_to_naturally_draw_out_a_pimple.pdfIn PDF document text
    • http://patudesaruvob.atwebpages.com/gokibimaduruwire.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/vemuwujuna.pdfIn PDF document text
    • http://bujekotu.atwebpages.com/childrens_yale_brown_obsessive_compulsive_scale_symptom_checklist.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/vufakigoja.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_off0000ef70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF70 5588 bytes
SHA-256: cefc812b1438c4d5b7c024d00e6637f0d4ae06ee24c86c793e6a03208ae9006c
font_01_sfnt_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 10460 bytes
SHA-256: ea58e2950fecf0040fb8c5c0ac4dd9f0919748dfbb19b6958b492d15581111a7

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