Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb54748c7161b47…

MALICIOUS

PDF

80.5 KB Created: 2021-04-05 04:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ad0aa8c41d3bdc7b0a3cd8eda99700c1 SHA-1: e0cf09e0e1093a98367bd26306c6e69c98a413c2 SHA-256: 4eb54748c7161b47b9f4138ac9daf19577693bc2f5bd85a80a7570deeb04897c
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains, and one specifically uses a UTM term related to online games, suggesting a lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a link farm on disposable hosting, reinforcing the phishing or malware distribution intent. No scripts were extracted, but the structure and embedded URLs strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/strik?utm_term=english+speaking+online+games PDF link annotation
    • http://lumufurisazela.mywebcommunity.org/religesapeg.pdfIn PDF document text
    • http://affilateapp.online/how_to_become_an_apprentice_welder_in_albertat1z1m.pdfIn PDF document text
    • http://sesizuxewewax.mygamesonline.org/82896847460.pdfIn PDF document text
    • http://helpcenter.business/rowegamejepimofibn1yy6.pdfIn PDF document text
    • http://fogafiv.mypressonline.com/adjective_order_practice.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzirixowev/nhagegd/colors_that_go_with_red_and_black_plaid.pdfIn PDF document text
    • http://tegekagag.22web.org/84163242268.pdfIn PDF document text
    • http://kexedeziferu.sportsontheweb.net/ziruwafasekunuwope.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/gjunZhb/iihf_hockey_drills.pdfIn PDF document text
    • http://fullpisetc.ru/80581090132wxm0l.pdfIn PDF document text
    • http://maxoranano.sportsontheweb.net/ziseremi.pdfIn PDF document text
    • http://1xbet-football.fun/25076866412urao8.pdfIn PDF document text
    • http://ruwegekugite.22web.org/78504248293.pdfIn PDF document text
    • http://remontnatali.ru/goxogifowexigdksi5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_cc70b7fc697f48ec8f26d0703c992c1c.pdf?index=trueIn PDF document text
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_984b96f4c7f44eea9738287db7403bf0.pdf?index=trueIn PDF document text
    • http://wikatamuk.rf.gd/baby_emoji_pictionary_game_answers.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_f9e83f756632489d8a63c13cebf38d5a.pdf?index=trueIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_40b5665264d84698ad19eb88354ce036.pdf?index=trueIn PDF document text
    • https://a7ed8af5-5e4a-4eaf-98d7-51655494ca15.filesusr.com/ugd/b5c45a_7e5ae4d825404c569419c69705dffd3c.pdf?index=trueIn PDF document text
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_3b26e173c59c4dd5be0a2fb9187a1ab0.pdf?index=trueIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_7fe499f6857a4789b671477b35414e0e.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 5160 bytes
SHA-256: 28b9acdfa00935d1c8c39c45f428038cc93e35e783488562458a49ab92211996
font_01_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 11008 bytes
SHA-256: 5a711f58189cb4faba153e1df39647f41ee437f09ce044de347d4a4e38e2293f
font_02_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449