Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fff8191cf80125b…

MALICIOUS

PDF

91.0 KB Created: 2021-03-17 03:01:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e47f787312ce520894b8d08b2b0e24c8 SHA-1: 717d51fc1e1372f06d43ff03823257c3aa33d32f SHA-256: 5fff8191cf80125bdea3e8612d705ad110c4c3791b51d1a437e1e5f0e52266f0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDF files, suggesting a link farm or SEO poisoning tactic. One of the embedded URLs, 'https://seumenha.ru/wix?keyword=omega+psi+phi+background+check', is suspicious and likely leads to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=omega+psi+phi+background+check
    • http://rcasino.info/kowipevanenosenomw1g20.pdf
    • http://stankoff.org/indian_stock_market_today_predictionipymm.pdf
    • https://rotemewan.weebly.com/uploads/1/3/1/3/131380756/ludagebawisawujirug.pdf
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/a61a5.pdf
    • https://wujuwali.weebly.com/uploads/1/3/5/3/135326068/5916916.pdf
    • https://vamubediva.weebly.com/uploads/1/3/4/9/134901044/07df8e60c.pdf
    • http://3203epworthcres.com/5972932068pb02r.pdf
    • http://makamar.xyz/discovering_our_past_a_history_of_the_world_student_editionwxzbi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wopari/buwib.pdf
    • https://uploads.strikinglycdn.com/files/b8a2a3fa-6204-459c-9631-b568c56e1a0d/suxesokuk.pdf
    • https://s3.amazonaws.com/fejififimaketo/emiway_bantai_song_lean_on.pdf
    • https://s3.amazonaws.com/xufoxorog/pikivu.pdf
    • https://uploads.strikinglycdn.com/files/083c605e-639a-423e-8ae2-7fc9de0b1ce8/harry_potter_y_el_prisionero_de_azkaban_20_aniversario_espaa.pdf
    • https://s3.amazonaws.com/feborobegibew/la_cumparsita_sheet_music_free.pdf
    • https://s3.amazonaws.com/lupuvogotog/24899827020.pdf
    • https://s3.amazonaws.com/vuterijoze/spreadsheet_software_free_excel.pdf
    • https://s3.amazonaws.com/susonanezaj/divutewojatafu.pdf
    • https://s3.amazonaws.com/viregujipowuru/bad_boy_status_image.pdf
    • https://uploads.strikinglycdn.com/files/7d45d277-b0f9-4b05-a0a6-e2e75ad7b188/20817152337.pdf
    • https://s3.amazonaws.com/joterige/morningstar_capital_market_assumptions_2019.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123d8.bin
b7cea48e1d09400dc9254619271f518d0992f761b7d202bbcc994c00fabc6013		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123D8 5684 bytes
font_01_sfnt_off000136f9.bin
ed22944a950d54e78999942b1a972b26a26f2640817bf05c3f0c8bc1875a3f0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136F9 11976 bytes

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