Malicious PDF — malware analysis report

Static analysis result for SHA-256 a379a51aad85915f…

MALICIOUS

PDF

64.4 KB Created: 2020-12-03 14:17:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 7e9505ed79f54d3b228768f62dfb1e81 SHA-1: d680d7079fcdf139f9ecd21ec790fef247eb339d SHA-256: a379a51aad85915f536b0de41535c7dfd5bbca538fb228b263b0be8b366e5743
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of a 'utm_term' parameter in one of the URLs indicates a potential phishing lure related to school district registration.

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/123?utm_term=south+huntington+school+district+registration PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5fabae2c5ccf7.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/sakitivezilike.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/latavupefiso-xumexeromawaniw.pdfIn PDF document text
    • https://kazajiti.weebly.com/uploads/1/3/4/4/134456981/ziwatoxuvijase-nowaru-kitaduwet.pdfIn PDF document text
    • https://gomigara.weebly.com/uploads/1/3/4/7/134727279/2315580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428334/normal_5fc5422633e6c.pdfIn PDF document text
    • https://lenimupet.weebly.com/uploads/1/3/4/0/134013040/9126683.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/dozuga/cylinder_volume_and_surface_area_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/59715712057.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fe386b97992eb55c938e/t/5fc62bc3a97599144ecbb04e/1606822852287/mopovuxuvije.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc35f47ec917750a3e7896c/t/5fc4b409f8cdb769c677eebc/1606726665741/armstrong_pullup_program.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fe2417e7202640eab110/t/5fc4d3cc08845d092421d415/1606734797697/lawumebojarajifijabama.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/2119231658.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_off0000c087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC087 5304 bytes
SHA-256: 69758f6584c3aa2335782e171e2f858a168dc4fe90e9acc08f6c7dbd99ef9707
font_01_sfnt_off0000d28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 10080 bytes
SHA-256: fde8134ce9e71a1db6a6ce790e2302cd237ebfd9bd452b9f4784c2620ee353a9

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