Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed33def3c8ffade7…

MALICIOUS

PDF

79.7 KB Created: 2021-05-23 12:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7542659788e07eb1febc821ac8e9e407 SHA-1: 33426a0a6760ef4e85e0e78f47cfa94f41dde56f SHA-256: ed33def3c8ffade736902d09ed92c4938d7520d7eb43e416868df17064bcc55c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The primary attack pattern involves leveraging a PDF document to host a deceptive link farm, potentially for SEO manipulation or as a distribution vector for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=mla+online+article+citation+example PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374369/normal_605843be03e02.pdfIn PDF document text
    • https://tavimemake.weebly.com/uploads/1/3/7/5/137513296/gufamuten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426415/normal_5fdb77a4ab935.pdfIn PDF document text
    • https://fejoburu.weebly.com/uploads/1/3/0/8/130813906/c07c5.pdfIn PDF document text
    • https://lamuwopinu.weebly.com/uploads/1/3/4/6/134632291/4713823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475729/normal_60386feb55fa0.pdfIn PDF document text
    • https://fofonamid.weebly.com/uploads/1/3/4/8/134869219/getepotesawu_vokide_moxebaro_pazidarezuwel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448743/normal_60163e93e10f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494136/normal_5fee72448f720.pdfIn PDF document text
    • https://nijeliwawinezim.weebly.com/uploads/1/3/4/4/134497061/niduz-zesaleze-fivojetunuponap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406501/normal_606ae53a09474.pdfIn PDF document text
    • https://bososotozakep.weebly.com/uploads/1/3/1/4/131437593/sedimonumimise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_601b430b15adb.pdfIn PDF document text
    • https://jodowofimen.weebly.com/uploads/1/3/5/3/135330599/gamib.pdfIn PDF document text
    • https://jazolesapixol.weebly.com/uploads/1/3/1/4/131453041/8872247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_5fd5f42b08ad7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481065/normal_5ff7d92d35415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465389/normal_6055ca08f2733.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/0f557fc1-21c3-4495-bbc8-9bf19ce4afce/calculating_acceleration_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/671beb81-3593-4580-8bb8-57edc929bbc5/lisevezowideje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6366c843-dbbf-476a-bcc3-ce55c676b7f8/pimafufiligowosen.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_off0000fa53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA53 4972 bytes
SHA-256: 7200a21ebbb80828a7dd1f4f039759b0df1be954178d8b12680679e0c61510c1
font_01_sfnt_off00010b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3A 11452 bytes
SHA-256: 434389fe8db2a6d2aa17677426a3dad6d66b79d961b0432fefe5d0e936011990