Malicious PDF — malware analysis report

Static analysis result for SHA-256 6770acbf9f747db9…

MALICIOUS

PDF

74.2 KB Created: 2021-04-02 00:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 73cdd08186e26eada336904318d1d3ca SHA-1: 8b2564468082476d524fadc146bc83e763a58878 SHA-256: 6770acbf9f747db9a854cbacbc85b7a4b171f8f74ecee6eb81d6ddc67b813209
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 domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The presence of external URIs and link farm heuristics suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/award?keyword=arcgis+online+tutorial+pdf PDF link annotation
    • http://parkji5x.xyz/wilefes33h.pdfIn PDF document text
    • https://cdn.sqhk.co/konajera/geRLCTQ/lite_fm_playlist_malaysia.pdfIn PDF document text
    • http://creditscoreusa.info/nobegogasetativosenutepffpu2.pdfIn PDF document text
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/ziguful-mibililifuf-kamevemewudag-besolelebex.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/hhaggig/wemoji_whatsapp_sticker_maker_iphone.pdfIn PDF document text
    • http://boviriso.22web.org/fekisas.pdfIn PDF document text
    • https://kexezesokofu.weebly.com/uploads/1/3/3/9/133986719/659545.pdfIn PDF document text
    • http://mexicotop3.xyz/ksp_1._8zxy8a.pdfIn PDF document text
    • https://lemusovigezamo.weebly.com/uploads/1/3/1/3/131381045/fijasuv.pdfIn PDF document text
    • https://tazesudi.weebly.com/uploads/1/3/0/9/130969012/doposazosebimusoweg.pdfIn PDF document text
    • https://cdn.sqhk.co/ragebobeb/jbggK6R/talking_tom_candy_run_android_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/T1NHjb3/36340228007.pdfIn PDF document text
    • http://pizedajunar.22web.org/jikobek.pdfIn PDF document text
    • http://supernefritroller.xyz/18052835370szevm.pdfIn PDF document text
    • http://rankingcoach-apps.com/introductory_linear_algebra_by_bernard_kolman_8th_edition_solution_manualfavk1.pdfIn PDF document text
    • https://cdn.sqhk.co/zujubiviv/4igVFgc/sekunaduwej.pdfIn PDF document text
    • http://espaceabone.com/82724166142jkxda.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/kotidox/63908818082.pdfIn PDF document text
    • http://nifibomagogov.rf.gd/aggiornamento_android_9_samsung_note_8.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/jay_cutler_nutrition_guide.pdfIn PDF document text
    • http://tuvajitivozozek.rf.gd/12879644130.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/nulenevubotowitujokegajil.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/the_circular_ruins_themes.pdfIn PDF document text
    • http://xonekalanalu.epizy.com/vowels_worksheets_for_sr_kg.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_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 5312 bytes
SHA-256: d5d7ba98525880ccff7f8d1e5589355bcba1211563f27f77a877239d84d318a0
font_01_sfnt_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 10740 bytes
SHA-256: 285d8a97879cdee0f13d85e85d7a974ccac28da9ee964a43578fcb4cb44307fa

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