Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eceefb1d3d85764…

MALICIOUS

PDF

143.3 KB Created: 2021-03-17 17:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dd0fdf98ca0293e617bdbedd9a9cf13c SHA-1: b55e7342e305dcd0a421a3c7dd6338901286d986 SHA-256: 8eceefb1d3d857645c94004b0cbb2e095cc73e7bde7fa6385e06e35a55229d91
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a high volume of outbound links, with one prominent URL being https://jottigo.ru/strik?utm_term=top+notch+fundamentals+b+workbook+answer+key+unit+14. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest an attempt to lead users to phishing or malware hosting sites, aligning with T1566.001 (Spearphishing Attachment) if delivered via email.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jottigo.ru/strik?utm_term=top+notch+fundamentals+b+workbook+answer+key+unit+14 PDF link annotation
    • https://masevaru.weebly.com/uploads/1/3/5/3/135346062/vodadipegepabi_fabatovofog_bovavaxukovuzif_kilojer.pdfIn PDF document text
    • https://leludexubivavij.weebly.com/uploads/1/3/1/8/131860378/f9893c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490370/normal_6043f03527bd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485015/normal_600a4de3693f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466161/normal_60489d3b8abdb.pdfIn PDF document text
    • https://gopoxigubujazu.weebly.com/uploads/1/3/0/9/130969754/0cdc2045f9cae.pdfIn PDF document text
    • https://taburexil.weebly.com/uploads/1/3/4/3/134374137/c3347e5f4bb8a5.pdfIn PDF document text
    • https://pesudimudoselu.weebly.com/uploads/1/3/2/6/132681392/ee338.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/2652024.pdfIn PDF document text
    • https://dopizuledukure.weebly.com/uploads/1/3/2/3/132302960/3e6aa82477e.pdfIn PDF document text
    • https://purigimotefejis.weebly.com/uploads/1/3/4/3/134308192/6604147.pdfIn PDF document text
    • https://kunobile.weebly.com/uploads/1/3/4/5/134517695/6097248.pdfIn PDF document text
    • https://galojonebe.weebly.com/uploads/1/3/4/3/134353990/kasikedi-porirovedi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuvipapijulabu.epizy.com/29844079451.pdfIn PDF document text
    • http://kiwizenodemi.epizy.com/introduction_to_cell_and_molecular_biology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1bf3894-e696-47d9-9128-84ba846f92f1/the_boy_in_the_striped_pyjamas_book_cast.pdfIn PDF document text
    • http://pobikifi.rf.gd/motorola_mc55_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58db0893-5e92-4098-b717-0ed67e37383d/uma_breve_histria_do_brasil_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e1ec1e2-31be-4a33-9186-02b08654a2b0/33611135958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c500e2-ea27-46e8-9ed9-e6de66a4cd38/84327914010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3498f089-a4e3-4cb4-951b-858ac4e3eaa5/88567458866.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_off0001d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9F3 5884 bytes
SHA-256: 2d3b84a625d38a8b0b9efc09d25c212099bc19916c75c2f3e0627bfe6a985b7f
font_01_sfnt_off0001edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EDEB 12964 bytes
SHA-256: 5d76a7833384d1e2d15add607786fa745f09608134de167525fdea65b42f2179
font_02_sfnt_off0002198c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2198C 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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