Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea8352251454d93…

MALICIOUS

PDF

80.2 KB Created: 2021-05-14 04:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a85bd30fe71318b5a92e45c8a72162fe SHA-1: 15eba04eba92836240c6aab0d918afe96f6ba395 SHA-256: 5ea8352251454d93e0e620c84f3d4bab2b7ac956e31a14636800c622c1c1a330
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL leading to a site that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to workplace conflict resolution, likely intended to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/strik?utm_term=how+to+resolve+workplace+conflict+in+nursing PDF link annotation
    • http://idealica-official-it.website/gidasidatukanewepafetalo4zrmk.pdfIn PDF document text
    • http://in-arenas.com/zajekyghkq.pdfIn PDF document text
    • http://vashobereg.com/dodge_dakota_service_manualh7wy1.pdfIn PDF document text
    • https://cdn.sqhk.co/bebetirifam/jdXdigF/colony_attack_apk.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/vonorivizabapena.pdfIn PDF document text
    • http://businesslinecenter.com/zitomalivelijekewegezu1q3mq.pdfIn PDF document text
    • https://cdn.sqhk.co/tudenireso/imijpEd/knives_out_castle.pdfIn PDF document text
    • http://english-10.site/587706827258cyvt.pdfIn PDF document text
    • https://cdn.sqhk.co/datimemovuko/jfgcXic/gotejasuzefer.pdfIn PDF document text
    • http://songkfrk.site/how_to_use_krups_coffee_grinder_f20328tm2.pdfIn PDF document text
    • http://winoorama.website/lonagegokanizadakesu8nytu.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwuzasemifo/ifYCjjK/buwokupifeti.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/lateral_thinking_puzzle_books.pdfIn PDF document text
    • http://azakalaza3.xyz/78174254361bahw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/afcb5044-4e04-4373-a64a-d2cf6ebc7592/birevaxojisivesowo.pdfIn PDF document text
    • http://xipanizi.myartsonline.com/14737717762.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/al_quran_english.pdfIn PDF document text
    • http://wodowepakimeko.onlinewebshop.net/lugetupiwomifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b279740d-cf28-4381-86f2-fd2aa96f8fca/is_222_a_bad_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d1c1fe1-b978-46bb-9a9b-770d1ff4fdfc/nafetalifagogab.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/nazodisojogitiwurapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd5e2de0-2d8f-4861-96ab-46221434d266/what_does_page_breaks_mean_in_microsoft_word.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/stanford_design_thinking_free_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a554750-c8c1-49e0-8828-70b6c765e355/el_arte_de_la_guerra_en_espaol.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_off0000fbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 5360 bytes
SHA-256: bd1e11c39b9dcc3f1e8613d733dafd89a54b2c738687e7b8e0166d602f13cc41
font_01_sfnt_off00010e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E23 10648 bytes
SHA-256: 72c1293b015b0f7e5fb324df7634fe93b71ba938efb134493c47dfd60315909f

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