Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d64231b709d9ff…

MALICIOUS

PDF

75.8 KB Created: 2021-02-25 03:25:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: f848679a3e60eb546212beb8206811c5 SHA-1: 0ccfcccdcd741690704c9d6b246d0587b42196a7 SHA-256: 74d64231b709d9ffdb7b0dd9170fc9aab7a9e21601b59e35a2708a782541f882
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a machine learning model indicating high maliciousness. The document body, though heavily obfuscated, suggests a lure related to a 'Taleo recruiting user guide'. The numerous embedded URLs, many hosted on disposable domains, indicate a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=taleo+recruiting+user+guide+17 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384308/normal_5fd7d5dd7f754.pdfIn PDF document text
    • http://meetlait.pro/beretta_92fs_vs_92_compact7j4tm.pdfIn PDF document text
    • http://astrohelp.space/movie_hd_latest697c0.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/the_brigade_pros_focus_during_the_military_decision-making_process_mdmp_is_on.pdfIn PDF document text
    • http://usesalon.xyz/pathfinder_kingmaker_wiki_companions622ob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446776/normal_60323e1a38322.pdfIn PDF document text
    • http://wekawuro.22web.org/foxisexunofajuf.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/nomukotap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500208/normal_5fca42d17e015.pdfIn PDF document text
    • http://kadesevi.iblogger.org/92195241760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476427/normal_600fe330d6eea.pdfIn PDF document text
    • http://pafugiwerokamez.iblogger.org/chrome_offline_terbaru_2018.pdfIn PDF document text
    • http://fudasoba.iblogger.org/velocity_and_acceleration_worksheet_the_car_race.pdfIn PDF document text
    • http://qrettalq.online/sql_database_management036t8.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/do_weight_watchers_scales_need_batteries.pdfIn PDF document text
    • http://micrometerdigital.xyz/33459273666dmvkb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buzetori.epizy.com/25427433295.pdfIn PDF document text
    • http://bajobakokela.epizy.com/sijebitamow.pdfIn PDF document text
    • http://savejanaxejov.rf.gd/daxenifefofurovojopepiba.pdfIn PDF document text
    • http://tefozofikiduja.epizy.com/nidewanepubevu.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/rinnai_infinity_20_installation_price.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_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 5188 bytes
SHA-256: a16f1b21c444519d4ce2af15aef4494a30525ac510c3911b8a7f52416f5f39fb
font_01_sfnt_off0000fee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 10136 bytes
SHA-256: dd42fa018ae4176ffc9a9a09d66d94750df47fe10d33c609ca9374e9cc7d13f9

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