Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a5e4a96e139532…

MALICIOUS

PDF

77.6 KB Created: 2021-06-07 14:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 94265da7a44a77e5c48053d404536aa9 SHA-1: 47dc2d8e0d25e37fe5c82975024c88bade857ee7 SHA-256: 86a5e4a96e139532080f96fbd48289bc467f4604b7bbea7152b66f627226b267
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://queure.ru/pbw?utm_term=baixar+livro+casamento+blindado+completo+gr%25C3%25A1tis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391623/normal_6055f95fc7adc.pdfIn PDF document text
    • https://vudiwajexisipu.weebly.com/uploads/1/3/4/0/134096418/momifi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376103/normal_5fee65ec562ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403674/normal_602a3718c9837.pdfIn PDF document text
    • https://gebekogekikak.weebly.com/uploads/1/3/4/6/134694855/19f94cdfb72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417025/normal_604148a05147d.pdfIn PDF document text
    • https://zufulakoloti.weebly.com/uploads/1/3/5/3/135301661/b67cf7e39e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462974/normal_604cdd7a1301c.pdfIn PDF document text
    • https://xapozate.weebly.com/uploads/1/3/4/6/134698203/jufaviv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406777/normal_5fd9bebcc8fe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421058/normal_603ff16c278d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_6052eeaa17be2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385847/normal_5fece8d5c2b65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kufugaref.pbworks.com/f/jukokamowezopofabojubel.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/w/file/fetch/144577809/20623282404.pdfIn PDF document text
    • http://fosirodovo.pbworks.com/w/file/fetch/144754386/pioneer_avic-z110bt_reset_button.pdfIn PDF document text
    • http://kukepofarit.pbworks.com/f/english_language_and_composition_section_1_answers.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/w/file/fetch/144451098/business_statistics_mcqs_multiple_choice_questions_and_answers_arshad_iqbal.pdfIn PDF document text
    • http://zeranagaro.pbworks.com/w/file/fetch/144748200/50250323561.pdfIn PDF document text
    • http://sovafiben.pbworks.com/f/54403513946.pdfIn PDF document text
    • http://vowijeve.pbworks.com/w/file/fetch/144782028/bikuxegafivumorajudus.pdfIn PDF document text
    • http://kemulosomul.pbworks.com/w/file/fetch/144654774/61755797661.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_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 5944 bytes
SHA-256: 3b62c953f8b72f38076043e1849550cc85b58f2242e9f66d37046af010d44bbb
font_01_sfnt_off0000fdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 13368 bytes
SHA-256: 02c0fc9372126f761ccfb097d63d30c862f76058541d768312e36446dfa2cddc