Malicious PDF — malware analysis report

Static analysis result for SHA-256 c424be25a97d6766…

MALICIOUS

PDF

77.1 KB Created: 2021-04-27 06:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a13ddd937bb464c381611ca48843e8f6 SHA-1: d49290d0f184176b59543830ca05d1e42d414e4d SHA-256: c424be25a97d6766849d728462d9bd2c6bc897597363f06a2ebfedc21b8877e7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external URIs, many of which point to disposable hosting and are used in a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites.

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://jottigo.ru/strik?utm_term=what+are+your+weaknesses+examples+public+speaking PDF link annotation
    • http://drive4mclanemilwaukee.com/dawupowayicgn.pdfIn PDF document text
    • http://magawiwove.22web.org/vemubovijadatituvenos.pdfIn PDF document text
    • https://cdn.sqhk.co/wotutovebo/RheW4ib/v-_models_for_interdisciplinary_systems_engineering.pdfIn PDF document text
    • http://agent-ritual495.online/wristech_blood_pressure_monitor_troubleshootingy3zq4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481170/normal_606da46f610bd.pdfIn PDF document text
    • http://reduslim-europa.site/wojabolusicyp.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzonabudad/ihjbfjg/21768820014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450043/normal_6015a0ba4c973.pdfIn PDF document text
    • http://fc-aromat.ru/algebra_2_online_textbook_pearsongsgqo.pdfIn PDF document text
    • http://usacreditscore.info/90495555305hqtby.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_605b3830b8e69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473947/normal_602eb935b15c3.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/ggFSHAq/grama_sachivalayam_answer_key_paper.pdfIn PDF document text
    • http://my-favshopc.online/bilarisuwogdavv3.pdfIn PDF document text
    • http://heartcenteredequestrian.com/fight_list_answer_us_allies_during_ww2grpeo.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://uploads.strikinglycdn.com/files/d95aaa43-cd50-4843-b9ec-d8c20e34e3c4/85864820990.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/140dfd2a-379b-47d7-ae91-ccfa4ae27a90/23776552403.pdfIn PDF document text
    • http://womirejosowasu.epizy.com/73444164274.pdfIn PDF document text
    • http://mimonutemabase.epizy.com/mudubuvuxozalivafimenuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d4d4205-14ae-47a4-9077-ef124c53f603/9590216172.pdfIn PDF document text
    • http://musarozopod.rf.gd/80116676491.pdfIn PDF document text
    • http://luvomovasofigu.rf.gd/clinical_guidelines_for_chronic_heart_failure.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_off0000e285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE285 5708 bytes
SHA-256: 12a2922cab6b2f8ed0fe2d347df231e18df85b252901a9f8c181fc8f7adc05d3
font_01_sfnt_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 10184 bytes
SHA-256: 8ebbd78dd49fe1edc62867877052da9c8c96c53ea2e3dc8ea98dbf8201128a36
font_02_sfnt_off000118cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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