Malicious PDF — malware analysis report

Static analysis result for SHA-256 e612ae5b86124fa9…

MALICIOUS

PDF

88.5 KB Created: 2021-02-18 06:54:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8e15a2c044a82500001773082f1754b0 SHA-1: 32a02d864a7e029bdf91ac3f0542a6a5788fb904 SHA-256: e612ae5b86124fa9e59373685eaae2be8e27d16ccdc512aec60c55f2a36e4b9f
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://jottigo.ru/wix?keyword=graduated+cylinder+measuring+liquid+volume+worksheet+answers PDF link annotation
    • http://bullbananavannaone.xyz/genetic_basis_of_inheritance_mcq_with_answerff4de.pdfIn PDF document text
    • http://zobebukore.22web.org/fawiwawiditutadeduzub.pdfIn PDF document text
    • https://fexifeter.weebly.com/uploads/1/3/4/6/134612515/paruborur-kakinip-vijisumavaf.pdfIn PDF document text
    • https://rezezeveg.weebly.com/uploads/1/3/1/8/131871466/wiwevajeremaz-bojafetef-telezuwewevu-pulozujadiriro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408593/normal_601c95da1b691.pdfIn PDF document text
    • http://zuzudijibogojag.22web.org/cfop_algorithms_all.pdfIn PDF document text
    • https://sojagimizalafar.weebly.com/uploads/1/3/5/3/135317111/mizibasej-fexuxanagujajav-berotekedimav-mobutow.pdfIn PDF document text
    • http://hr-insider.com/chhota_bheem_pirate_attack_gamenw4f8.pdfIn PDF document text
    • http://guvetosufawi.22web.org/99582265891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475570/normal_6027089821dd8.pdfIn PDF document text
    • https://cdn.sqhk.co/jagawubu/5YXgjie/34760573410.pdfIn PDF document text
    • http://itravelgr.com/pejotifitebavamufivej43kh2.pdfIn PDF document text
    • http://zivufomureko.22web.org/cooks_essentials_electric_pressure_cooker_model_99700_manual.pdfIn PDF document text
    • http://kushtanash.ru/salapmv6r0.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/c674c6a669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485318/normal_601db7f7989bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zisubaripuxiba.epizy.com/taberekavepi.pdfIn PDF document text
    • http://tiguvazigavis.epizy.com/birthday_song_with_name_in_english.pdfIn PDF document text
    • http://wafovon.epizy.com/what_do_boogers_form_in_your_nose.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 3300 bytes
SHA-256: e42f199171f85d360e0221c5a0c3c64fa53625560a9d2f5864c7919640aaccf8
font_01_sfnt_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 5828 bytes
SHA-256: efee06c19f35f73758cd79f6c18dcd45c4dc6a8250b985d9a4eedbdb47dd7ad1
font_02_sfnt_off00010d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 2128 bytes
SHA-256: c1cf3c30360affad9dd12fb1617437c51a1558e5451820f3229a685efc0bde43
font_03_sfnt_off0001170b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170B 10348 bytes
SHA-256: e2ac6c45fb0920af95fdb143ed55b9bd888a10461ed933315f13160408495073
font_04_sfnt_off00013a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8A 17148 bytes
SHA-256: 7f33a17dbb7d0584d523b35968ffadc214456ff1ac5f04e7674356e57da8e76a