Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aee28d886e7291c…

MALICIOUS

PDF

72.2 KB Created: 2021-03-20 09:14:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 775fc8845d70e6d734c556fced6a850e SHA-1: 41346a425b8acdf959650d290c5a6dcfca7bd953 SHA-256: 2aee28d886e7291cae5ec895872804c5a784632827e037e154e2fbd2dc0438f6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. One prominent link, 'https://seumenha.ru/123?utm_term=bdm+nsw+change+of+name+application+form', impersonates a government form, which is a common lure for phishing attacks. No scripts were extracted, but the overall structure and URL distribution point towards a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://seumenha.ru/123?utm_term=bdm+nsw+change+of+name+application+form PDF link annotation
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/zawinakadululirirum.pdfIn PDF document text
    • http://repair-telefonov.ru/3982789724181eq6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_5fe97043edbea.pdfIn PDF document text
    • http://risonubokedoxav.scienceontheweb.net/sap_wm_configuration_tcodes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385863/normal_5fd05b0527acf.pdfIn PDF document text
    • http://xoxosedefoxadu.mygamesonline.org/bhagavad_gita_18_adhyay_in_gujarati_download.pdfIn PDF document text
    • http://siondez.ru/comentario_biblico_matthew_henry_sin_abreviar_gratis4h78h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402533/normal_5ff1217b16a09.pdfIn PDF document text
    • https://befadileniralan.weebly.com/uploads/1/3/6/0/136082268/1436032.pdfIn PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/zakujojoguz_rijekufuno.pdfIn PDF document text
    • http://trixy-matrix.space/bladderwort_plant_informationjubqx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403541/normal_602e36f71bf9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452609/normal_5feb1eb14e2eb.pdfIn PDF document text
    • http://instahelpforbusiness.com/lizosadefidikugincx8y8.pdfIn PDF document text
    • https://rewudorabemomaf.weebly.com/uploads/1/3/4/2/134234845/dinokixato.pdfIn PDF document text
    • http://merovew.xyz/monthly_expense_tracking_excel_templatenq8kx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_604a0171f3e10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378425/normal_5ff0dbf6104e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wadoromutisagar.myartsonline.com/compare_and_contrast_essay_topics_for_university_students.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/example_of_lab_report_biology_microscopy.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/90682386011.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_off0000dc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 5712 bytes
SHA-256: c8252e7aa159ba5fcc3a86646d68df28e62f0cde3c281456f07f60b21b1845d6
font_01_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 10476 bytes
SHA-256: 51f07fb7a90bf07c6960683416ac0637c43e89e2724233c2394da55eaa235ad9

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