Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4460b454f744968…

MALICIOUS

PDF

122.9 KB Created: 2021-03-23 22:24:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 312ddf854f69f871f6ddd81c938a6e61 SHA-1: 9f07128c1908ac10426f67bb452206d9a43e3360 SHA-256: d4460b454f744968c6e663992a6e8b97473bd986bfac7bfa2cb7787c5ffa433e
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, 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 embedded URLs point towards a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://dugedepap.ru/award?keyword=sociologija+politike+pdf PDF link annotation
    • http://gemofesane.medianewsonline.com/english_grammar_check_online_free_no_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450158/normal_5fd3b717b1b8d.pdfIn PDF document text
    • http://fupefabesosada.mygamesonline.org/diccionario_de_biblioteconomia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449788/normal_5ff4674619f0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501645/normal_60323bdee86d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450890/normal_60533f78862b2.pdfIn PDF document text
    • http://jufanurozud.getenjoyment.net/sozasonem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_60364ca0984e5.pdfIn PDF document text
    • http://gitikirazidapi.medianewsonline.com/siditil.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/OgjIibY/truck_icon_top_view.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/is_homework_beneficial_for_students.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/0gh1Agj/69564552679.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462038/normal_5fddaf5b2be0e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b04f55-60a1-4917-add1-178fa2ff6926/wulorom.pdfIn PDF document text
    • http://gegilifopom.myartsonline.com/how_to_operate_a_ninja_professional_blender.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/625ab843-8df6-42ce-b9eb-23b796d8818b/romance_of_the_three_kingdoms_12_pc_download_free_full_version.pdfIn PDF document text
    • http://lexekuduwowig.atwebpages.com/becoming_a_supple_leopard_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22fe21d4-97c2-46de-8199-7fe0c054d237/galileo_life_summary.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_off0001a675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A675 5292 bytes
SHA-256: 3b540f85eef34a5154df075ec3ea1f739b482483884900cacd829c5b8abf6d83
font_01_sfnt_off0001b89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B89E 11952 bytes
SHA-256: b08556a0cff6d5e6e1742c9772071d3ba4885fb27fcd37de01f792d0a3240fcc

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