Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6aba96e2f513144…

MALICIOUS

PDF

83.2 KB Created: 2021-06-12 05:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 97610dc0c3fb0ef2c10479beb3621cae SHA-1: 59215d8bec1aee6c79f67db17a42c53288bf5669 SHA-256: a6aba96e2f513144e30dbb3992cdb9c96c8e89a353038a23e89f2e9091cd49ac
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://laborke.ru/pbw?utm_term=trinomio+cuadrado+perfecto+ejemplos+pdf PDF link annotation
    • https://towoxaji.weebly.com/uploads/1/3/0/7/130740158/jimiwozi_tevuk_dagizujevabu_fegawutipupako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375204/normal_602c4aaf2e895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403563/normal_6056de6c2831f.pdfIn PDF document text
    • https://kolivobaka.weebly.com/uploads/1/3/4/5/134500933/kubijofulebematov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375197/normal_5fe03ed57c2e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_6050c705978d8.pdfIn PDF document text
    • https://sivutonawoxed.weebly.com/uploads/1/3/4/6/134687919/550a7ae.pdfIn PDF document text
    • https://nonefipuxope.weebly.com/uploads/1/3/4/4/134493331/9149e.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/3f74c0dff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423145/normal_60c2a80b13cc3.pdfIn PDF document text
    • https://tovadifu.weebly.com/uploads/1/3/4/0/134096489/nuzaxunidoja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460694/normal_602036b910c57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gonumutat.pbworks.com/f/doutrina_e_teologia_de_umbanda_sagrada_download_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9a8df59-fdcb-428b-b085-76d1c8de4e16/8121515918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe158f2-2c6e-4efa-92c1-364b59ff7b0f/quantos_livros_tem_na_bblia_da_igreja_catlica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e949cafd-a2fc-4a3c-8acb-8d72b2928d20/xazusuwovofalofoxinokos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33edf513-860e-4914-aa9d-a20013717c76/6934347701.pdfIn PDF document text
    • http://razodegotit.pbworks.com/w/file/fetch/145170807/download_autocad_2014_student_version.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/f/23568632364.pdfIn PDF document text
    • http://maxasol.pbworks.com/f/sovitubusoditafidomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a39af432-f1d4-4712-9cd0-ad89fac92727/misowoko.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 5328 bytes
SHA-256: 97a3ce2fae54c4acf0e0c346fe7eb5fba9144edf1aad1d8ff58a56ce67227b57
font_01_sfnt_off000100e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 11988 bytes
SHA-256: ef26dd47ac1e1841aeef49852d1fa55fc4bb9bf276b94158307a4a4ba176b5e2
font_02_sfnt_off00012888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12888 16088 bytes
SHA-256: 51b8d4c4f17389d80b23040d591c0dccb099bca9103ea84f58116e310badbe13