Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea840e0b9f8b21d…

MALICIOUS

PDF

106.9 KB Created: 2021-05-25 10:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f70d19ffb90d87d9a579901ba8ae851e SHA-1: 2c0fef373dbe99bf80670af1aadba1dae54f4021 SHA-256: 8ea840e0b9f8b21d75dc2384a9b38832f8000621a76701dbc15d4d4f3ec0bef0
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, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or ad fraud. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious or ad-heavy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/strik?utm_term=word+problems+on+multiplication+and+division+for+grade+5+cbse PDF link annotation
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/a1dd99.pdfIn PDF document text
    • https://fifitedogij.weebly.com/uploads/1/3/4/7/134747960/rekelilupekerigife.pdfIn PDF document text
    • https://fanuxerejupu.weebly.com/uploads/1/3/1/3/131398214/2236743.pdfIn PDF document text
    • https://sunupukub.weebly.com/uploads/1/3/5/3/135319403/zetamuvatenuko.pdfIn PDF document text
    • https://guxumexowe.weebly.com/uploads/1/3/3/9/133999944/sovov_gofitibud.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/bdef948664df4c5.pdfIn PDF document text
    • https://pafufido.weebly.com/uploads/1/3/1/4/131407890/tekimave-piwewasezesilu-fogimixe.pdfIn PDF document text
    • https://memibufosigi.weebly.com/uploads/1/3/1/3/131383384/farovilokako.pdfIn PDF document text
    • https://zemedabumudog.weebly.com/uploads/1/3/2/7/132712209/lunozok.pdfIn PDF document text
    • https://sinemitivivofa.weebly.com/uploads/1/3/0/7/130740142/todexa_dimazege_zurar.pdfIn PDF document text
    • https://vezafowifav.weebly.com/uploads/1/3/1/6/131637603/jofavotajukuli.pdfIn PDF document text
    • https://leponinidokawe.weebly.com/uploads/1/3/4/5/134502666/pefesi_zaxepakap_dezunefufa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1798f8bb-1c06-4cc6-a0ff-bc607365bcde/posonujokijobibilit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca58349a-af7c-49f5-97a7-584378559f8d/46789216646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69dc89e7-c098-42c2-b975-27c521bf40c6/17383060845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/818f627f-f95c-4a16-9616-8b895343cab6/tagewodimuramugozusiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd8d0a77-96df-4317-9ace-b15dfecebebb/xolesalejupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a17a2227-209e-48f0-94f2-a868729147e9/70539959109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e004fd19-cbe4-46d2-91d3-b31b0799fa38/flammable_storage_cabinet_requirements_cal_osha.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B85 5696 bytes
SHA-256: fd8820e6d8ea6e06cf368c8e5ab7e88175e9724f68c88a5210ca7189161336c5
font_01_sfnt_off00014eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EEB 12480 bytes
SHA-256: 1afc648c5fb67e7c7282b91a99f2b5fd3dd85f2b3ae1296abbf571607521fa41
font_02_sfnt_off00017993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17993 16244 bytes
SHA-256: 16ec414cace6f9f4ac9df7549ec8631f7a74fa0329fdf51642f8f1834267c5a8
font_03_sfnt_off00018f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F0C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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