Malicious PDF — malware analysis report

Static analysis result for SHA-256 6032348536386cc6…

MALICIOUS

PDF

72.6 KB Created: 2021-03-07 20:52:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 0d750abbc59dc68f6157043badd14990 SHA-1: 3875ab92ec513ec85f512f22da5510211408544a SHA-256: 6032348536386cc61097d4ee9561d18cb6dd6a158658b601e52682fcdb075c33
186 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 or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://vilenefex.ru/wix?keyword=compound+words+worksheet+with+pictures PDF link annotation
    • https://poxixarusel.weebly.com/uploads/1/3/4/1/134131789/4953938.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489601/normal_5fed9c841ee20.pdfIn PDF document text
    • https://defelewag.weebly.com/uploads/1/3/2/7/132741475/suxep_ganewumip.pdfIn PDF document text
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/755aa6.pdfIn PDF document text
    • https://novigavaze.weebly.com/uploads/1/3/0/8/130874354/d742f51.pdfIn PDF document text
    • https://kezexawu.weebly.com/uploads/1/3/0/8/130814062/ruwemavabem-dosolopun-moziseg-nozatebos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390680/normal_5fdeefa330bfc.pdfIn PDF document text
    • https://roxadaxakisa.weebly.com/uploads/1/3/1/4/131437443/buxorad.pdfIn PDF document text
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/dizigibezo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477155/normal_601f9eb1c2c2d.pdfIn PDF document text
    • https://wubuzafovotul.weebly.com/uploads/1/3/0/8/130814439/6188802.pdfIn PDF document text
    • https://zolefixu.weebly.com/uploads/1/3/4/4/134432518/2222064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409098/normal_600e570ba9dc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473375/normal_5fdb884a9265e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ee93aba-afe9-4ea2-8f22-fdaa2ec35f1b/bexiranoxijemesefexomub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b6fb4ca-18e1-41a6-b9cf-56a0cec22fba/behavior_plan_examples_autism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a79e68-e5b3-47ff-a5f7-f99e8f4352f9/forofasezajoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8168526-bbed-4af8-9319-8d86df45f83b/why_is_ebook_important.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0edc45-94a0-4e60-89d9-cb5701142a80/62923514779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eb773fa-71f3-46c0-b8bf-50ef2d615bb5/95814629902.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/jolepezutexuba.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/32061275184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b9ffb99-609c-4d47-9441-94202a4dfed5/best_interview_questions_seth_godin.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_off0000df68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 5132 bytes
SHA-256: 6b84ffd41b2bf6754899140f564cebbdd0b7860f5c22d7c0a93dce186145826c
font_01_sfnt_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 10748 bytes
SHA-256: 7e009a353db25b554400e48e9b0e237c7c68f57c02cf79796d89096c891dea3d