Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd79391fe1c96f15…

MALICIOUS

PDF

75.1 KB Created: 2021-03-13 18:10:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7ad1327488e6f08dbbf1cd0bb8cd03de SHA-1: bbdda041bcd05e6ac4c39e1b9e2abe75ce8aeb53 SHA-256: bd79391fe1c96f156d5324bc820ebf5c717d4a37192fb0d84c83c144df4b7b84
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic to drive traffic to potentially malicious sites. The embedded URLs and the PDF structure strongly indicate an attempt to redirect users to external content, likely for malicious purposes such as phishing or malware distribution.

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://nipisod.ru/strik?utm_term=walter+riso+wikipedia+escritor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492250/normal_604a9665d3458.pdfIn PDF document text
    • https://maroxenewalid.weebly.com/uploads/1/3/4/3/134314996/3192771.pdfIn PDF document text
    • https://xokefazekuli.weebly.com/uploads/1/3/5/9/135992394/4948364.pdfIn PDF document text
    • https://fojomuku.weebly.com/uploads/1/3/4/4/134447263/3e1173bf976.pdfIn PDF document text
    • http://nusorogexirexi.22web.org/96168263820.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404105/normal_5fc5af403af0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376382/normal_5fda7622af3a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490263/normal_602c4d48a38d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425723/normal_5fda375d86a6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381759/normal_5fccea016ddae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_601b636d900ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459941/normal_600c029b3ed0e.pdfIn PDF document text
    • https://gevexivojuler.weebly.com/uploads/1/3/4/4/134444242/wipizewowunedev.pdfIn PDF document text
    • https://sozizupisez.weebly.com/uploads/1/3/1/8/131872239/c460d5d63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/metakibeme/saga_volume_1.pdfIn PDF document text
    • http://mufifofoge.epizy.com/android_studio_install_apk_without_usb.pdfIn PDF document text
    • http://luxezovofi.epizy.com/product_management_for_dummies.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/gejosotugadeketu.pdfIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_0647d2b7723444249ce53babb4cb0424.pdf?index=trueIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_5d568b3080d449ffa2fc98c840c6e6a1.pdf?index=trueIn PDF document text
    • http://rotanejepajedef.rf.gd/wow_classic_system_requirements_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/oppo_a37_rom.pdfIn PDF document text
    • https://ee67c5b3-b4d3-4257-b425-af55881d3a68.filesusr.com/ugd/c60da7_e75ffbe819c44a90bf2b35e6c8e21070.pdf?index=trueIn 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_off0000e56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 5236 bytes
SHA-256: 452d61107bc51a141fdd5f6cc68f4a2bfa0c873d55e1482f831f9c9eda87e0ab
font_01_sfnt_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 11668 bytes
SHA-256: 406dd7526042b3758559925fb211f9a64b08266813842f07e21fa4a12491688e