Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24442b00f00412c…

MALICIOUS

PDF

78.3 KB Created: 2021-06-06 19:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bde4ccea4d1254b27598852dfd491642 SHA-1: ea2ca8a94d07ad696cdab1240036cb669f1c6941 SHA-256: a24442b00f00412cf503c4db1d0ca0d2bf82aefbe5d33f253babc7603ca5aca1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://huntic.ru/pbw?utm_term=how+do+you+clean+the+jack+lalanne+power+juicer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377380/normal_604491c4b1367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470024/normal_604ba61973bec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506063/normal_60447041e7c69.pdfIn PDF document text
    • https://gususofutuzur.weebly.com/uploads/1/3/4/9/134901105/304d3ec18df180.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414682/normal_5ffe5208bdc57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457311/normal_5fd03bdee6684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_606093797632c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5fd262018871c.pdfIn PDF document text
    • https://rimidewazasi.weebly.com/uploads/1/3/4/3/134317879/womamotika_xovez.pdfIn PDF document text
    • https://wutotopuwa.weebly.com/uploads/1/3/4/4/134464713/juromusorifaza.pdfIn PDF document text
    • https://tubuwixufadone.weebly.com/uploads/1/3/5/3/135315283/9e16300be61b173.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426941/normal_6002059241c2a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fosirodovo.pbworks.com/w/file/fetch/144456630/ultrasound_anatomy_abdomen.pdfIn PDF document text
    • http://garifukedako.pbworks.com/f/ntn_flange_bearing_catalogue.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/f/lopibafabefekuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2d6056f-f725-4884-b6db-9b654b60482a/52917194175.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/how_do_i_find_world_war_1_service_records.pdfIn PDF document text
    • http://serukula.pbworks.com/f/what_is_the_definition_of_sensory_imagery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80070c7d-df2c-489a-92ac-7c03ef66e6fc/ponasadivinaluwuzobana.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/guia_de_consejo_tecnico_cuarta_sesion_2019_preescolar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d04231f-a7c1-4fee-b83e-dfd0158f7af5/romoje.pdfIn PDF document text
    • http://lulatigono.pbworks.com/f/zujikotuped.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30166801-bd0d-4ac0-abd2-1130a6444802/68078626501.pdfIn PDF document text
    • http://lebamojopa.pbworks.com/w/file/fetch/144582222/pusogavaxotid.pdfIn PDF document text
    • http://felefejimax.pbworks.com/w/file/fetch/144620211/descargar_juegos_para_ppsspp_gold_iso.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_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 5276 bytes
SHA-256: d5d4775ff112a29ea2dfefdd7231562bbb54d0becb893031651ec2329e1ccbaa
font_01_sfnt_off00010486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10486 10872 bytes
SHA-256: 4854bc995eca2e72e574436e62c4a261d0bfc9c95d7a3249b511cf0c2d80c2dd