Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c78d04d2f4d5eb0…

MALICIOUS

PDF

75.7 KB Created: 2021-03-28 09:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16a67e2f7eec18bc7a816cfaf5faa479 SHA-1: b2cc9740cf8c2d4db6fcbf82de4b94cae47989b1 SHA-256: 5c78d04d2f4d5eb0c9c49f327add5df1e0e21fa538897254cc78c6fb4077b35b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://lozipotod.ru/strik?utm_term=windows+display+orientation+hotkey
    • http://indonesia2health.online/weather_report_today_live_news7mgxu.pdf
    • http://dasezin.getenjoyment.net/familia_bombacaceae.pdf
    • http://dikegebe.mygamesonline.org/bhagavad_gita_para_todos_jack_hawley.pdf
    • http://cleanup-sale.site/davinci_iq_vs_pax_3_vs_mightyfpss6.pdf
    • https://murozukuzofapu.weebly.com/uploads/1/3/4/7/134716639/negopetiv-nubinej.pdf
    • https://fikazimibugexu.weebly.com/uploads/1/3/4/5/134515259/pusosotakib.pdf
    • http://digitalmedialit.com/antiques_roadshow_theme4kx27.pdf
    • https://dosukasexu.weebly.com/uploads/1/3/1/6/131637789/xevexijajutajobu.pdf
    • http://metagopu.22web.org/45595301959.pdf
    • http://rijoginijamibeg.mypressonline.com/adobe_acrobat_reader_dc_download_kostenloser.pdf
    • http://revilokepudidu.mygamesonline.org/cuisinart_bread_maker_replacement_parts.pdf
    • https://kuvezuwuziteb.weebly.com/uploads/1/3/4/3/134388010/a6f6f925db67.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jofesosozofoso.epizy.com/96313344037.pdf
    • http://nidotezuk.epizy.com/mu_answer_sheet_toeic.pdf
    • https://ac6a5e95-3fab-4d4b-a7e7-0ef4c71e5929.filesusr.com/ugd/32c278_4927b7c90b824483bf1e04bcdf202f9a.pdf?index=true
    • http://vetiluxakosimut.epizy.com/how_do_you_use_a_pampered_chef_food_chopper.pdf
    • http://papetamunamu.epizy.com/what_is_the_salary_of_information_technology_in_india.pdf
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_081e2f31d0d54dcb8ab65e4b1aea8551.pdf?index=true
    • https://5637a596-61ce-4e67-8953-8fd9cb84b940.filesusr.com/ugd/c20ea7_2ff207d586f642ad81af1ac8c21dd42c.pdf?index=true
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_05f106fd42714d53b3da7a5411569ca2.pdf?index=true
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_a326e81671e340699c464ecca79d3e76.pdf?index=true
    • 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_off0000e7a6.bin
344f4b325eb0f9bf406df601496d4ad1aed27ec6e794fed02484c1dca967c8dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 5320 bytes
font_01_sfnt_off0000f9cc.bin
b6a44bd778fc6ded47e9ba1ba88c62074ee8dc52f368c89dffb7e60ea07517aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 11356 bytes

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