Malicious PDF — malware analysis report

Static analysis result for SHA-256 1537165639485e87…

MALICIOUS

PDF

75.2 KB Created: 2021-09-10 00:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: af66661a7fa4b6e6cdf36a16ee1be339 SHA-1: 3a9b66cbb8371554669d9b0b7eeff6365a0b2b2d SHA-256: 1537165639485e87f0c4de64bf1bd98667eb6ecfce8c22ea295ccf9b55ece78a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially compromised or malicious domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may leverage embedded JavaScript or exploit vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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 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 http://inarchengineering.it/userfiles/files/liguralaso.pdf In PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/wotelisabinemifezodup.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/97150529294.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/94099513771.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/1657171020.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/jesufonekododusuf.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/17448148400.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/4719519226.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/bafoleledafofubaludoga.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/10785203253.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161393f05960d4---67693761891.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/lirur.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/45848327321.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/mewefavuk.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/wagokepumun.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/rokafovogudateva.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/bc68dc5b5fe54b2244b0e8c321db4e36/24341884260.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/dejewoki.pdfIn PDF document text
    • http://panteres.com/files/files/gedakiwifepuwedaledukixe.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/79015426296.pdfIn PDF document text
    • https://shevian.com/images/file/zalezajolidif.pdfIn PDF document text
    • http://zenithmetals.com/files/xofuweje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=siren+head+sound+roblox+idPDF link annotation
    • 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://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_off0000bc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7A 19092 bytes
SHA-256: d3b46a8768a510d2dd0fb708c990dc13c09253bb0ae26b6657aea77c4f9f6eaf
font_01_sfnt_off0000ef34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001074b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 10664 bytes
SHA-256: 710540578474b5c93f98ec7be861f8bf62ba4ce923c0ff0d91ed7960df0abedb