Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7ebf6b8a976ce3…

MALICIOUS

PDF

47.9 KB Created: 2020-11-07 00:33:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b56adc82c4a533957685784f67e9993e SHA-1: 37e661708a23c3f9a960ff5d7cc5a550657924b3 SHA-256: 1b7ebf6b8a976ce3ea633a5c7bfe072d2001930ae8d126b63f99cfd593a9778d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains heuristics indicating it is a brand-impersonation credential phishing lure, specifically impersonating Facebook. It directs users to a redirector URL which ultimately leads to a disposable hosting domain. The embedded URLs suggest a phishing campaign aiming to harvest user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://kadamoxezegawuf.weebly.com/uploads/1/3/4/3/134347408/6618962.pdf.
  • 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://trafffe.ru/aws?keyword=dd+1970+manual+dispatch+form+army PDF link annotation
    • https://kadamoxezegawuf.weebly.com/uploads/1/3/4/3/134347408/6618962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5f98fce194c94.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://wotenopofe.files.wordpress.com/2020/11/budixaw.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/the_best_shooting_games_unblocked.pdfIn PDF document text
    • https://rezumisoju.files.wordpress.com/2020/11/etude_de_situation_educateur_spcialis_corrig.pdfIn PDF document text
    • https://zapawex.files.wordpress.com/2020/11/zisugakojotenabor.pdfIn PDF document text
    • https://mefedekig.files.wordpress.com/2020/11/56976389214.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/76554754486.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/word_with_ein.pdfIn PDF document text
    • https://zebililoz.files.wordpress.com/2020/11/71568141007.pdfIn PDF document text
    • https://penorabod.files.wordpress.com/2020/11/83454956010.pdfIn PDF document text
    • https://rewuvitosil180903676.files.wordpress.com/2020/11/motuxajipadilitonem.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/93469708815.pdfIn PDF document text
    • https://viwatisoj.files.wordpress.com/2020/11/sample_answers_to_performance_appraisal_questions.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_off000078ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78EA 5924 bytes
SHA-256: b86b01a68fcae5bf351b1798d436d989669910ff796abfaa7012353d56c38558
font_01_sfnt_off00008d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D05 11268 bytes
SHA-256: bb6ed955a8788a7482b4d4ecaafc17d9dc78bfa6b9df1f2d5b16bcb766c6ab69

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