Malicious PDF — malware analysis report

Static analysis result for SHA-256 57401de98ff4c638…

MALICIOUS

PDF

84.1 KB Created: 2021-04-04 08:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: efc31c6bae4dea06c3caa99e3bdcfc31 SHA-1: 57fefd5c20ca5f0e39ed8577238cf1e8f7450887 SHA-256: 57401de98ff4c638e7a365e77ef2a0e9bd1c1592bd909a95a17d068a73ab770c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=el+alquimista+paulo+coelho+en+ingles+pdf PDF link annotation
    • https://cdn.sqhk.co/wikaraxixi/bljhiho/87163208078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450516/normal_5fdc496d338d2.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/n5VifmH/steam_chat_history_folder.pdfIn PDF document text
    • http://koreanluxe.com/giwuputalelojukd765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387718/normal_6047890acf898.pdfIn PDF document text
    • https://cdn.sqhk.co/zirigajer/jeibiaJ/dental_assistant_programs.pdfIn PDF document text
    • http://hookup157.site/gre_practice_test_1_quantitative_reasoning4im52.pdfIn PDF document text
    • http://bestsalestoday.xyz/39741070485zugm1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_6011b7b63ab82.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/4df658e5-08ca-4162-8327-25d3e126f9df/16253279273.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/49780616070.pdfIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_26c192a3df5d4655a6b3b6f686a2d100.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0774eb29-0905-4f66-a93c-fc387a88af22/porque_sale_linea_alba_durante_embarazo.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/sat_preparation_classes_in_delhi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3172c7-5938-4c14-9150-4e6ca659dd74/futekovadobej.pdfIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_96f3126e396f4d1184c8ebb7b136b2b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/zebugopaxetusu.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/muvilunago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e30cc0-6cac-444d-9363-bebe666cd501/jemizakedobisemutaxalif.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/words_synonyms_dictionary_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/946f094e-686e-4c7b-ae5d-9ab8aaa644a4/67085742972.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_off0000faa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA9 5440 bytes
SHA-256: 7533ff9bdff71a07b63a1532c4ad6a1144ce7a1d247eb927d0de7d6caa4f7de4
font_01_sfnt_off00010d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 11860 bytes
SHA-256: a4e718848f0239f168c5357d5943f73b134402b8be7678ba18db2f6037c2087b
font_02_sfnt_off000132f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333