Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e144fa893f86cf5…

MALICIOUS

PDF

114.8 KB Created: 2021-01-11 21:54:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9486df5b0371adbcfd37e7262abfd7b8 SHA-1: 98db5931095e64935dff9b0a3e5eba6d3b8e30c9 SHA-256: 9e144fa893f86cf5c248ac5467212079d238f80f61277f420987b3c765695aef
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://trafffe.ru/123?utm_term=remainder+estimation+theorem PDF link annotation
    • https://firupewuvub.weebly.com/uploads/1/3/4/3/134330425/9403078.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/4791618.pdfIn PDF document text
    • https://site-1168507.mozfiles.com/files/1168507/abyssal_demon_guide_rs3.pdfIn PDF document text
    • https://site-1168325.mozfiles.com/files/1168325/bingo_at_home_app_points.pdfIn PDF document text
    • https://rexaririwe.weebly.com/uploads/1/3/1/6/131637114/246eb7017.pdfIn PDF document text
    • https://site-1171776.mozfiles.com/files/1171776/70780713157.pdfIn PDF document text
    • https://site-1178453.mozfiles.com/files/1178453/faith_family_academy_dallas_texas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f8720a285e4d.pdfIn PDF document text
    • https://site-1168250.mozfiles.com/files/1168250/gabafulitewifodereto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_5f8f4d96ab29b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5fb011fc2954d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408584/normal_5ff4163141580.pdfIn PDF document text
    • https://site-1176993.mozfiles.com/files/1176993/81117281416.pdfIn PDF document text
    • https://site-1168221.mozfiles.com/files/1168221/nenajuzesagulimesejeg.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
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15737 4828 bytes
SHA-256: f5ca8e21f5f6708ec9d982ec1a808b435fb904194485aec7b72ce6c4175d79dc
font_01_sfnt_off00016765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16765 14968 bytes
SHA-256: 00761ac91966b0f0e6e5d1b917074172c6245125f2044bfd705d0b76ffbb2f11
font_02_sfnt_off00019878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19878 16644 bytes
SHA-256: aaddddb06dfca567ced7764fa792ca739a4c35e667d60340973db216776196bc
font_03_sfnt_off0001af9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF9E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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