Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4b677111563955…

MALICIOUS

PDF

89.0 KB Created: 2021-04-01 03:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0f4e2118153c7eb16da9fe81122b6475 SHA-1: d14c172b5066175cebad6c02fb689d801cc459db SHA-256: fe4b6771115639557f3f0b1e7c7d07af379334bfc11424113b1f429e238df2c2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm designed for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/wix?keyword=frutos+del+espiritu+santo+biblia+reina+valera+1960 PDF link annotation
    • https://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/kufob.pdfIn PDF document text
    • https://xazovobarobek.weebly.com/uploads/1/3/4/4/134403102/5703457.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/42535558692.pdfIn PDF document text
    • http://vaxenovutejuzid.sportsontheweb.net/wibixulukuvoberinu.pdfIn PDF document text
    • http://dasazopemobor.mywebcommunity.org/malayalam_novels.pdfIn PDF document text
    • https://cdn.sqhk.co/vidikusupegu/gWhcHjg/assassin_s_creed_unity_companion_app_pc.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/que_organos_conforman_el_sistema_circulatorio_del_ser_humano.pdfIn PDF document text
    • https://cdn.sqhk.co/vopuvafamiw/gjKihig/81647030641.pdfIn PDF document text
    • http://tawaguf.scienceontheweb.net/44857337312.pdfIn PDF document text
    • https://bugitepekasi.weebly.com/uploads/1/3/4/6/134669175/26c5eb.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/modul_akuntansi_keuangan_menengah.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vobozezojip.onlinewebshop.net/farebi.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/jelagoledenamabo.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_3f814575aee24344b82aafab09fad0a4.pdf?index=trueIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_a215b93a3c694b8b83415b9c468cd9db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/where_did_agriculture_begin_in_africa.pdfIn PDF document text
    • http://fotizojorirepel.onlinewebshop.net/21666598837.pdfIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_0552df2c51de49bfa942bb873853e144.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_739ac95a582a48749c5e0fec3e6e4896.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zikeko/coreldraw_2019_keygen.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/carrying_you_laputa_piano_sheet_music.pdfIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_63bb65cdb8fb4d7cb7f972c14279bf1d.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_off00011bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BED 5612 bytes
SHA-256: 475c0815f6653394e957df2e48dc5d517911ed6dd0356ff7fef4cd620f7c321c
font_01_sfnt_off00012f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F04 12020 bytes
SHA-256: f4f7414ecdef2aed4c0295ce0c1e35543bd63329242d61b6d745ff777b16717b