Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85a015eca4dc0fb…

MALICIOUS

PDF

79.1 KB Created: 2021-04-03 04:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca81a13e821728320ac70a69e247eb3d SHA-1: afe37c50dc826815bb2aa67dc84a6e50f47d482f SHA-256: a85a015eca4dc0fb99f53261b50e460a62ac4e4d3df58803e303d41369415bc0
166 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, a common tactic for hosting malicious content or phishing pages. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method used to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://finoginujowiwi.mypressonline.com/how_to_read_your_birth_chart_wheel.pdf
    • http://mscredit.info/72859088706pqs4v.pdf
    • http://viwesisikumebi.getenjoyment.net/how_to_write_calligraphy_letters.pdf
    • http://ultra0.space/survival_horror_zombie_shooter_gamep1lhx.pdf
    • http://ptmonline.ru/evernote_apk_latest_versionlfnbf.pdf
    • http://nezowigivomi.scienceontheweb.net/antennas_and_wave_propagation_book.pdf
    • http://gifinibufenatar.medianewsonline.com/40543098863.pdf
    • https://static.s123-cdn-static.com/uploads/4494668/normal_6007905d75077.pdf
    • http://trenketo.buzz/icc_concrete_manual_2015vsx24.pdf
    • https://cdn-cms.f-static.net/uploads/4402488/normal_60595a4fd26a7.pdf
    • http://kogowetek.getenjoyment.net/37715642437.pdf
    • http://newoxoxi.mywebcommunity.org/23927743151.pdf
    • http://fomigiv.mypressonline.com/maxikiforevokalavu.pdf
    • https://cdn-cms.f-static.net/uploads/4527108/normal_601156194fb5c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/jJyWpsOf3IE/wb?keyword=libro%20de%20acordes%20para%20piano%20pdf%20gratis
    • https://9370005b-87d8-49d8-b27c-18dce193a2f1.filesusr.com/ugd/52ea04_1c593cd2c07747aca15731f0ee80ae9e.pdf?index=true
    • https://s3.amazonaws.com/teximikamukubo/how_to_share_photos_privately_on_facebook.pdf
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_ec5fa076238c41c6adfc47806487c2a9.pdf?index=true
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_30cc685845404509af5eea6feaf73c01.pdf?index=true
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_ef89f2840e7d4a8a90936d55745c85f1.pdf?index=true
    • http://terumalok.atwebpages.com/73278702210.pdf
    • https://s3.amazonaws.com/zupenafud/sopa_de_letras_para_imprimir_portugues.pdf
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_693aeaa379f4444dbef7e4f20267b18e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f644.bin
aaaab900c61a175110309618bd2382b0a9aef718c444398cbbcaf622b699e862		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 5372 bytes
font_01_sfnt_off00010894.bin
83efba4442c94c9cac6cc1c911c0e6f385b499edf4fba7e4a043321d14f7bb81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10894 12252 bytes

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