Malicious PDF — malware analysis report

Static analysis result for SHA-256 3585addea01bd613…

MALICIOUS

PDF

76.7 KB Created: 2021-04-05 05:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b84b5bf5f216dd2024309fdbcb2c6ea7 SHA-1: a1cbf44e01dcee21442abc205431c5f7309b563d SHA-256: 3585addea01bd6138bddc9cd7d76aeaed786c5ca722afd1cd5d5cb264e037312
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cdn.sqhk.co/lesepivir/2gjjTsh/fotudigumovosoga.pdf
    • http://gratoram.site/zufutubibazovenepamevabdbxoe.pdf
    • http://ridunculus.com/6403698038o4z21.pdf
    • https://cdn.sqhk.co/baluwofuk/8hfhfhb/ocean_dream_hotel_cancun_mexico.pdf
    • http://lotukaguw.sportsontheweb.net/asus_laptop_q550lf_drivers.pdf
    • http://lazirawolewok.getenjoyment.net/modal_verbs_examples_sentences.pdf
    • http://caterm.ru/stihl_weed_eater_parts_diagramgk8by.pdf
    • https://cdn.sqhk.co/powurejur/iiY8QqH/business_tycoon_online_secretaries.pdf
    • http://haustova.com/9729463984qzex.pdf
    • http://vajokopopozikem.medianewsonline.com/14446579224.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/jJyWpsOf3IE/wb?keyword=do%20i%20use%20the%20left%20side%20of%20my%20brain
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_8b85557ce33c46248c1338a3cbdeb48b.pdf?index=true
    • http://luzeparuzibez.rf.gd/generador_de_vapor_industrial.pdf
    • http://xolagetomijured.epizy.com/forensic_accounting_for_dummies_free_download.pdf
    • http://zozafiromilofin.epizy.com/free_autocad_2007_for_windows_10.pdf
    • https://s3.amazonaws.com/fajixe/28145688776.pdf
    • https://s3.amazonaws.com/polojuliragam/refijixarofasuzek.pdf
    • https://s3.amazonaws.com/pesetufavo/financial_statement_analysis_project_report.pdf
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_f95d85fabe9d4317a6d477875c3a5846.pdf?index=true
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_1f47949a37634886a95992b9a9a70feb.pdf?index=true
    • https://s3.amazonaws.com/banula/safety_1st_easy_read_forehead_thermometer_user_manual.pdf
    • https://s3.amazonaws.com/dutimajizowa/network_administrator_interview_questions_and_answers.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_off0000ecfb.bin
943398b1c34b4e01a1b6b31261629dfc9683f93d08d213ccd3e140a1ac6b3833		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 5388 bytes
font_01_sfnt_off0000ff28.bin
fbb0c7982aceafd56ddbfb2acd7692e9a1ccb7e4afbca60dc5daebbc65d3b09e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF28 10788 bytes

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