Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb71bedbd6f1c787…

MALICIOUS

PDF

71.6 KB Created: 2021-06-10 15:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 154a0853177fd87758fda427d6e8e659 SHA-1: e413f7ddfd031510d80bd9796f35f242a0143902 SHA-256: cb71bedbd6f1c7879743d31ec3081e5ac2171546ed616046f13f92f4674c7296
286 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Steal or Modify Data T1059.007 JavaScript

This PDF document functions as a credential phishing lure, impersonating the Gmail brand to deceive users into clicking a link. The link, disguised behind a fake CAPTCHA or human verification prompt, leads to a redirector that ultimately points to a PDF file hosted on Weebly. The presence of multiple external links and the ML classifier's high confidence score indicate a malicious intent to harvest user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://rixevabibevata.weebly.com/uploads/1/3/2/7/132710753/wanokasobe.pdf.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://medvor.ru/pbw?utm_term=google+account+manager+6.0+frp PDF link annotation
    • https://rixevabibevata.weebly.com/uploads/1/3/2/7/132710753/wanokasobe.pdfIn PDF document text
    • https://betutoza.weebly.com/uploads/1/3/4/8/134899773/2367799.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444098/normal_600869e941dc7.pdfIn PDF document text
    • https://razesune.weebly.com/uploads/1/3/3/9/133986972/guwosesaf.pdfIn PDF document text
    • https://pakipuxis.weebly.com/uploads/1/3/5/3/135347710/6241103.pdfIn PDF document text
    • https://gapudozesaneg.weebly.com/uploads/1/3/4/5/134525911/digafoji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384819/normal_60b97f04d3bc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485822/normal_6043839643052.pdfIn PDF document text
    • https://fepexugoroba.weebly.com/uploads/1/3/4/4/134469665/jufutimavepenoj.pdfIn PDF document text
    • https://damokilusul.weebly.com/uploads/1/3/4/4/134463963/jinojapoxevepovat.pdfIn PDF document text
    • https://vatopefo.weebly.com/uploads/1/3/1/3/131398509/gimox_bejox_botavuvisivul.pdfIn PDF document text
    • https://powadurax.weebly.com/uploads/1/3/4/6/134621507/tujomuped-banunimupito.pdfIn PDF document text
    • https://jiditejebata.weebly.com/uploads/1/3/5/3/135305220/gesen_wixitoxefonoto_mofageva.pdfIn PDF document text
    • https://bosebekepomij.weebly.com/uploads/1/3/4/8/134870535/566fb2a.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/2481079.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xovakovawup.pbworks.com/f/complex_numbers_jee_mains_questions_with_solutions_download.pdfIn PDF document text
    • http://pezaloribed.pbworks.com/w/file/fetch/144628980/rarenekovokixonepazig.pdfIn PDF document text
    • http://pajawazo.pbworks.com/w/file/fetch/145019901/lefabilunikuvajixefuroz.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_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 5516 bytes
SHA-256: b2abe9ad1a6a8de0d97e1b406264e4fef497cb9bf9db7f77c4fc7074f47e5ac5
font_01_sfnt_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 11580 bytes
SHA-256: 9391d81041727aa72444050a56efb4711683913f489e964edcbafac37ffab007