Malicious PDF — malware analysis report

Static analysis result for SHA-256 506af558a7327d86…

MALICIOUS

PDF

78.1 KB Created: 2021-02-14 05:29:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f90e622b37187c0b74ea6e78e04db12b SHA-1: f2415c5378783ca63077b91701420c3e39293684 SHA-256: 506af558a7327d866fda4a8f773792bd6e1cde2f0f5cf3381bf454c86a9b537e
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a strong intent to redirect users to potentially harmful sites. The presence of 'utm_term' parameters suggests a phishing or advertising lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=nickelodeon+logo+history PDF link annotation
    • https://cdn.sqhk.co/pivugituxi/MHhbxje/6013837362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372355/normal_601a05ac55e98.pdfIn PDF document text
    • https://dabusoze.weebly.com/uploads/1/3/4/5/134585091/sigaxolawupaver_genapopixa_kigesodapa.pdfIn PDF document text
    • https://cdn.sqhk.co/jugomuzuteb/iaKKX3r/army_driving_simulator_3d_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387925/normal_601466801ab27.pdfIn PDF document text
    • http://milesnires.xyz/turn_off_screen_time_iphone_xhywp0.pdfIn PDF document text
    • http://mavpa.fun/permit_test_california_study_guidet3xu5.pdfIn PDF document text
    • https://siroxaje.weebly.com/uploads/1/3/4/0/134000026/0744ec447.pdfIn PDF document text
    • http://instapodarok.site/autodesk_maya_2020_tutorials_for_beginners19zca.pdfIn PDF document text
    • https://ziwolowuwuxux.weebly.com/uploads/1/3/5/3/135321756/5516147.pdfIn PDF document text
    • https://gupijevud.weebly.com/uploads/1/3/1/4/131407369/2661410.pdfIn PDF document text
    • http://byseles.xyz/wall_panelling72nja.pdfIn PDF document text
    • https://cdn.sqhk.co/ziloteduxemo/dEEtWG0/modern_history_book_for_upsc.pdfIn PDF document text
    • https://mafugefowodofo.weebly.com/uploads/1/3/1/3/131378796/wofasimufix.pdfIn PDF document text
    • http://ketousa.site/sojiraxuzirobekiwibalafdbjio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369900/normal_5fe857ede1994.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
    • https://s3.amazonaws.com/jezekemunidup/voot_apk_monk.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/83318975210.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 4912 bytes
SHA-256: cdb9ed6ac0d9c0711ed0e381a490a1f6741e8bb1e5b07c552be455bbc0483cc9
font_01_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 10276 bytes
SHA-256: d2c23a0c9820477ccd2aefff91d55f8fd563d2ff5dc3084fe491c82510f55094
font_02_sfnt_off00011cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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