Malicious PDF — malware analysis report

Static analysis result for SHA-256 4002bebce887c834…

MALICIOUS

PDF

73.9 KB Created: 2021-03-19 03:46:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7592bcfa2b16f3180376d68be1fc4722 SHA-1: bcba596ed8bc84879da94d4185617f2b34177af5 SHA-256: 4002bebce887c83473e01dd7b3f0a2eff231543be809238169049c2316485862
186 Risk Score

Malware Insights

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

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 0.9993

Heuristics 6

  • 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 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://maypoin.ru/wix?keyword=dolphin+emulator+android+apk PDF link annotation
    • https://nobawevedidilut.weebly.com/uploads/1/3/1/3/131379382/muzajegefefup.pdfIn PDF document text
    • http://filemarker.store/bubiwogafekitoxisolobisew8e1u.pdfIn PDF document text
    • http://tizeretozu.22web.org/how_to_operate_altec_bucket_truck.pdfIn PDF document text
    • http://stav-games.ru/steam_use_chat_effects5gj9z.pdfIn PDF document text
    • https://vudusozu.weebly.com/uploads/1/3/4/6/134629317/087af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469633/normal_5fe91455cc976.pdfIn PDF document text
    • https://xogefuvoza.weebly.com/uploads/1/3/2/3/132303221/3433801.pdfIn PDF document text
    • https://xaxarudo.weebly.com/uploads/1/3/0/7/130740130/gosazuxiladumo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453332/normal_5feb40e88e3a0.pdfIn PDF document text
    • http://discount50.pro/10954368945gm6rm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449984/normal_601ed92f04b59.pdfIn PDF document text
    • https://vawuwoteb.weebly.com/uploads/1/3/0/9/130969488/fakojoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_601580f06fc8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jowabew.epizy.com/66241403597.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_3524887289ec4e6ca55f2b63fdc3dc1f.pdf?index=trueIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_3f82f3b6ced24daf82cf23d10275cdfe.pdf?index=trueIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_0d183edade1647bc955c86fc0d675bf3.pdf?index=trueIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_4ca85ea3fdb7434187d7601675160550.pdf?index=trueIn PDF document text
    • http://jabaxuzadowepep.rf.gd/champcash_app_free_for_pc.pdfIn PDF document text
    • http://porumujowupof.epizy.com/bts_idol_live_performance.pdfIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_8fce9015ebc4415eb539d05f91e3b3d2.pdf?index=trueIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_8abee6703d374115b363c86f106637c0.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_296446f768284d4987f24bd54005b202.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_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 5084 bytes
SHA-256: 518adea274eaa3db44282026951dea252e7fd696a6324b6c62f2b72884fd513d
font_01_sfnt_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 10528 bytes
SHA-256: 3ea4c60133ec8f87094385a96c9992dbebc7641c2a6b03f5e289a9025e819ca6