Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6cca96348491e2…

MALICIOUS

PDF

80.9 KB Created: 2021-03-10 02:43:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 304f6b981fbb5b91ed234335ed2597b7 SHA-1: 2cfb32bb614fcc1ffe3040df383d8b826fa12d85 SHA-256: ea6cca96348491e27a2b633ec766ef4dcb6979d350bc9b4a26bde7da5c349107
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary URL observed is https://gimoguvi.ru/aws?utm_term=a+level+statistics+normal+distribution+table, which is likely part of the malicious redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://gimoguvi.ru/aws?utm_term=a+level+statistics+normal+distribution+table PDF link annotation
    • http://erogan-columbia.site/calling_you_bagdad_cafe6q0ue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407562/normal_6021cf0f5db94.pdfIn PDF document text
    • http://clientbluebadge.com/54883794550kzg4m.pdfIn PDF document text
    • http://usacreditscore.info/27881470715h1xrh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456984/normal_5ff65989bf0e9.pdfIn PDF document text
    • http://mavitrade.com/android_studio_logcat_dead85elw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_56ee9063b5374f8dbad22ac7abb7eb6f.pdf?index=trueIn PDF document text
    • http://tevefetilojas.atwebpages.com/operating_system_software_examples.pdfIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_a0967d6dacca4128a7216e65316f33d4.pdf?index=trueIn PDF document text
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_5a25985f2779414da15d21442b116d31.pdf?index=trueIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_c5c0de95a23348299958f46b08eacea3.pdf?index=trueIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_8a26ce685ece4eca82b809bc45131e11.pdf?index=trueIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_259a64cedb594e6d8c8d9f8d4a8b248d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farezelof/battery_calibration_apk.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/que_es_la_historia_universal_contemporanea.pdfIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_30686bdc422047bf9eefcfdd76faa9ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/the_maze_runner_series_movie_order.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/avital_5303l_review.pdfIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_523b65d7288b42c18eb3307ff1aba290.pdf?index=trueIn PDF document text
    • https://1527c8d3-3321-4e9f-872f-e2bebb57bac2.filesusr.com/ugd/bf2d42_4e77427673b84b30893ab04796e23abb.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 5272 bytes
SHA-256: 01a4682e17a3abeab1b4239b8abb072b0ccbbef8f2fc38a74c53f641c5c15815
font_01_sfnt_off000111e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E9 10484 bytes
SHA-256: 8e299467a474ce79977f93031b262d6bc7fcd277b80061ca9ac90d2931705176