Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a43d3340c5bd14a…

MALICIOUS

PDF

94.1 KB Created: 2021-04-04 17:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c6a78e846edd8a67ebd86fbe05b3efc1 SHA-1: 0737cf59bed63dc9c272ed6e4f1e5bb992f042eb SHA-256: 5a43d3340c5bd14a321e5c2e261d3575315f6b69b8ce17de636597f16fb5389b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/aws?utm_term=from+the+mixed+up+files+of+mrs+basil+e+frankweiler+chapter+summary PDF link annotation
    • http://lunamawel.22web.org/fenawufijixor.pdfIn PDF document text
    • https://zabonipe.weebly.com/uploads/1/3/4/4/134487368/9881547.pdfIn PDF document text
    • http://pibofari.22web.org/printable_weekly_calendar_template.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/6Wetgic/buffer_overflow_stack_exchange.pdfIn PDF document text
    • https://cdn.sqhk.co/toliximozupa/gRqR2rE/excel_vba_transpose_entire_sheet.pdfIn PDF document text
    • https://vezinamitin.weebly.com/uploads/1/3/5/9/135984824/vuxerenajuxagug.pdfIn PDF document text
    • https://fowuxodujokuk.weebly.com/uploads/1/3/4/3/134310829/9516851.pdfIn PDF document text
    • https://lilafigofuku.weebly.com/uploads/1/3/1/3/131398347/bobavanizusazuvagedi.pdfIn PDF document text
    • http://gorijas.iblogger.org/45565080553.pdfIn PDF document text
    • https://cdn.sqhk.co/sidogorego/f6jgcB8/resumo_administrao_pblica_para_concursos.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/fw1Nmij/streamelements_chat_alerts_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/Hjbyijg/gangstalking_austin_texas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vipujaxetixise.epizy.com/zidekotepevivapowawa.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/acid_rain_images_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/72_angels_of_magick.pdfIn PDF document text
    • http://lijukogibedatu.epizy.com/pmbok_vs_prince2_vs_agile.pdfIn PDF document text
    • http://minegavanifur.rf.gd/mipewidapapodizowatex.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A4 5816 bytes
SHA-256: c30dc7641483529c7c6c73af973bf0481d7afe2ca2fb22f8957cb9dc52c783c4
font_01_sfnt_off00012962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12962 12676 bytes
SHA-256: 83d2e4e78277697828d040417ce186686482d0f3fce6c3607412d20d6e4ed407
font_02_sfnt_off0001534f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1534F 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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