Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76d4e121c7c3277…

MALICIOUS

PDF

81.6 KB Created: 2021-06-02 10:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: de80e647bad09f4aa0556d8a8e40cd8e SHA-1: 5c7ac1fefe7fda6f849d1f871d23df06b1a37ef2 SHA-256: a76d4e121c7c3277277a839eaef44be0dd2acc8ab03611907ded691724e7e7dc
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to obscure malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards a campaign to drive traffic to malicious sites, potentially for downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/pbw?utm_term=mcpe+one+block+skyblock+map+download PDF link annotation
    • https://fiverepibimasi.weebly.com/uploads/1/3/4/8/134893498/nedimokuteneler.pdfIn PDF document text
    • https://lakujasoramaw.weebly.com/uploads/1/3/4/4/134400634/7678ec622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_601b2f0e4ef95.pdfIn PDF document text
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/223451.pdfIn PDF document text
    • https://movudari.weebly.com/uploads/1/3/1/0/131070737/2548256.pdfIn PDF document text
    • https://zaboxunur.weebly.com/uploads/1/3/4/3/134369304/rikanumexuzorugino.pdfIn PDF document text
    • https://purusoze.weebly.com/uploads/1/3/4/4/134495244/nazig.pdfIn PDF document text
    • https://zedesaxaratok.weebly.com/uploads/1/3/4/7/134733302/xupulibilubaxi.pdfIn PDF document text
    • https://wusiparopebabo.weebly.com/uploads/1/3/4/5/134505529/2590012.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_604e8a9831a6a.pdfIn PDF document text
    • https://satufikobupi.weebly.com/uploads/1/3/2/6/132695363/sibudoguza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413109/normal_6011e23b54c67.pdfIn PDF document text
    • https://zopadujebononi.weebly.com/uploads/1/3/1/3/131380983/bufobodo.pdfIn PDF document text
    • https://xizuzumuk.weebly.com/uploads/1/3/2/6/132682261/86c1cfe697155b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_602d81435b534.pdfIn PDF document text
    • https://bonagimeduvutup.weebly.com/uploads/1/3/1/4/131453121/musuwuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kukepofarit.pbworks.com/w/file/fetch/144447072/14349976351.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144413595/92862161987.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/nafibefived.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/lokajokawonubagaf.pdfIn PDF document text
    • http://jebusolole.pbworks.com/w/file/fetch/144483963/gajaba.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/f/52324176765.pdfIn PDF document text
    • http://joxupakager.pbworks.com/w/file/fetch/144489129/telangana_panchayat_raj_act_2018_book_in_telugu_download.pdfIn PDF document text
    • http://vananizi.pbworks.com/f/masterchef_australia_season_12_watch_online_uk.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/vukusotimoralowu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7E 5524 bytes
SHA-256: c7fa5560fb4fff33d10b208d483aaa0ff11def065f0175f579677481a17c0136
font_01_sfnt_off00011255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11255 11384 bytes
SHA-256: 02461889f0906f20c57e2ef832e130f9a4dcf435c7a4ac1ed52d6063e6996983