Malicious PDF — malware analysis report

Static analysis result for SHA-256 78171a26ab083873…

MALICIOUS

PDF

116.1 KB Created: 2021-03-22 13:55:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ab70cef03737dc128ab8a8d6df9089c9 SHA-1: 0d9e66b74fba509c38d60e1ce5437b18d5a0c17f SHA-256: 78171a26ab083873e1a770de7a6a978f59f1a343c46c77a5d9564c35d246d386
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites, potentially disguised as search results for educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/wix?keyword=go+math+grade+1+chapter+3+test PDF link annotation
    • http://fafabil.getenjoyment.net/duzigolulupesomul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374853/normal_6013ba5028518.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/everstart_maxx_3_amp_6v_12v_automotive_battery_charger_bc3e.pdfIn PDF document text
    • http://tigafik.mygamesonline.org/gewegoramorimidep.pdfIn PDF document text
    • https://cdn.sqhk.co/geruxibab/iihhcgc/refat.pdfIn PDF document text
    • https://cdn.sqhk.co/pategazikiw/zhgPjaH/epic_red_emoji_ball_free_puzzle_games.pdfIn PDF document text
    • http://nimolebefiv.22web.org/61226042667.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459321/normal_60048a5cdfebe.pdfIn PDF document text
    • https://cdn.sqhk.co/fosulavale/dY1ia1L/alita_battle_angel_movie_director.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417226/normal_603211cac4384.pdfIn PDF document text
    • http://liwadaxezaf.getenjoyment.net/jelotenavojebazifakug.pdfIn PDF document text
    • http://lunamawel.22web.org/tratamiento_angina_de_pecho_inestable.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dejenirapavo.rf.gd/insert_tab_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/long_black_backless_formal_dress.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/remstar_auto_a-flex_m_series.pdfIn PDF document text
    • http://vigavanoxe.onlinewebshop.net/xaxejokezegotajorabakurer.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_off0001724a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1724A 5700 bytes
SHA-256: 3abb495ef9a812c0a2dcc09078179d86cc77116a006e0da686503440d9da9bed
font_01_sfnt_off00018585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18585 11852 bytes
SHA-256: b3c4dc395df03da380f9cf972b5a9da3f5359e32c5bae08d09bc8cf6f44e9503
font_02_sfnt_off0001ad32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD32 16268 bytes
SHA-256: 3544f83899155b17444718ecaaf68011a3b42319c8e8ef4f33f5dfc760c2bb32

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