Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fb9b4d6850fffb…

MALICIOUS

PDF

85.4 KB Created: 2021-02-23 08:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5fcf8581946633bec80003d12ff646f0 SHA-1: e138f1b394a456f2a7bbbacfc3d205924e232740 SHA-256: 19fb9b4d6850fffb5a11450fce13d7810f7598b524f18e4a86dd6b84110f71b3
66 Risk Score

Malware Insights

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

The ML classifier and PDF heuristics strongly indicate malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to distribute malware or conduct phishing. The presence of external URIs and link farm indicators points towards an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://druttle.ru/strik?utm_term=present+tense+verbs+worksheets+for+1st+grade PDF link annotation
    • http://nugajawoteb.iblogger.org/sat_practice_test_6_essay_answers.pdfIn PDF document text
    • http://socialwave.me/ets2_realistic_graphics_modq38mp.pdfIn PDF document text
    • https://dudobafileziv.weebly.com/uploads/1/3/5/3/135331993/aa7efec2c59169.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/suzijulusejoeerys.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486563/normal_601e4c1b69db0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368250/normal_6007c3c371c6f.pdfIn PDF document text
    • http://guvizaw.22web.org/divergent_thinking_worksheets.pdfIn PDF document text
    • https://mogobuzuxoxede.weebly.com/uploads/1/3/0/7/130740257/4506046.pdfIn PDF document text
    • http://pogetukexuk.66ghz.com/eu_labour_force_survey_database_user_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418987/normal_5ff034f907334.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427795/normal_5fff9ca140264.pdfIn PDF document text
    • http://extrameets.fun/restraining_order_ny_form7h0a4.pdfIn PDF document text
    • http://reduslim-ufficialesito.site/new_trending_music_videos_download2jcvg.pdfIn PDF document text
    • http://fefosawixamuwow.22web.org/brochure_template_presentation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xetasif/conveyor_belt_speed_calculation.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/bahama_breeze_nutrition_information.pdfIn PDF document text
    • http://fesusate.rf.gd/ninulilofidomefekim.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/55014267326.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/27139130687.pdfIn PDF document text
    • http://kijijaxozaro.epizy.com/lapupakox.pdfIn PDF document text
    • http://xijivip.rf.gd/cbse_grade_2_science_worksheets.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_off00010cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF4 5548 bytes
SHA-256: 0c27b130fb2990502f72a79abaa14f539162dfc86292f91d0f98fbbe72d2e0ac
font_01_sfnt_off00011fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEA 12004 bytes
SHA-256: f0d5421fcccb78a8949b765f7ad16b5e6f51e38f3818217b614511998e3c58e5

Open this report in the interactive analyzer, or submit your own file for analysis.