Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c2d1b2c859647b…

MALICIOUS

PDF

73.4 KB Created: 2021-05-25 16:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 37303edaba3c64a9616b48efac7ce989 SHA-1: acc4b2271bf7bd9c7290771e20c180373a36dd89 SHA-256: 90c2d1b2c859647b5eb8674dde5eea890039552345bc1bf50eb76756996b8fac
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=technical+analysis+for+the+trading+professional+constance+brown+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4463803/normal_5ffaccd0d5faf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407060/normal_5fcd860b9af45.pdfIn PDF document text
    • https://ruzojewa.weebly.com/uploads/1/3/4/4/134437104/663292d02f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407304/normal_5fce0699d2632.pdfIn PDF document text
    • https://navojinalano.weebly.com/uploads/1/3/4/7/134755450/pepofeloxafed.pdfIn PDF document text
    • https://vatanivirasuta.weebly.com/uploads/1/3/5/3/135387760/2199393.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/3620273.pdfIn PDF document text
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/sezemozuguku-mexuwu-tokup-pokugez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414341/normal_6039b7f3e761f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409413/normal_5fe9ca0627475.pdfIn PDF document text
    • https://pikupazu.weebly.com/uploads/1/3/4/5/134577858/rowaz_remaziwa.pdfIn PDF document text
    • https://xikosenazegan.weebly.com/uploads/1/3/0/7/130739601/nibugidugidaluju.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/paxivogedewilu/vefajedilalofes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b845af4c-91b3-4a70-8215-a6218c6233c1/12581142934.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/56653592939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f267081-5304-4fa2-ae52-33ea617c537f/gokoniromijalenu.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/99969164908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac114d8c-2aaa-4e46-b8d9-6f8a86921d58/libro_de_fsica_2_bachillerato_udg_contestado_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/jovov.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/2035887967.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_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 5700 bytes
SHA-256: 28d040c74e21693e63b72c0fde907b4bc40282039128c4f8e21223d2a15d0153
font_01_sfnt_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 11888 bytes
SHA-256: 6ba4e65645cf7a22a57f6767d109b17a44760a2c61fa161964e64872c7253328