Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda00b4dd9f90cf4…

MALICIOUS

PDF

78.2 KB Created: 2021-01-12 10:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 42e0c26442bc65f88cb120240f6ea3d4 SHA-1: 9df7db0223a716b42c7ae6330b19c65b49f5bdfc SHA-256: dda00b4dd9f90cf4f70ee9603cfb34a6cabe0f81ac260f76477b17a7be27fc50
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various PDF files hosted on disposable domains and cloud storage, suggesting a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The primary IOCs are the external URLs embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/aws?utm_term=mindfulness+guided+meditation+jon+kabat-+zinn PDF link annotation
    • https://site-1166610.mozfiles.com/files/1166610/56594854745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385847/normal_5fa44a505a38e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_5fe8e87cc8132.pdfIn PDF document text
    • https://dapekedes.weebly.com/uploads/1/3/4/6/134643928/339efb1567ac102.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/3679612.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527747/normal_5fc7e499bfefa.pdfIn PDF document text
    • https://site-1177634.mozfiles.com/files/1177634/24136909776.pdfIn PDF document text
    • https://site-1166652.mozfiles.com/files/1166652/scert_assam_odl_marksheet.pdfIn PDF document text
    • https://site-1174383.mozfiles.com/files/1174383/27255037433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498834/normal_5fbd79ef98694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372073/normal_5fea0b8dae040.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://s3.amazonaws.com/xezujuxoz/wugilujutimopa.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/inventory_management_in_excel_free_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/kendo_grid_sorting_with_custom_template.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/talanolok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 5380 bytes
SHA-256: 1d9c86d2d86f113a008823b42cf105ac8e5119377d4445f314df9b9d355d2273
font_01_sfnt_off0000f848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 10220 bytes
SHA-256: a9308b5774ed41b57866fc796666dcc7673fb60db9c1ce8bbdff13529c7a4252
font_02_sfnt_off00011b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B30 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

Open this report in the interactive analyzer, or submit your own file for analysis.