Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef524d85f12ba9dd…

MALICIOUS

PDF

76.6 KB Created: 2021-01-19 09:47:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 28fcd6ff9c8b5a9d8ae8cb2117b6ec58 SHA-1: c2f2b4ee5a975af6c55927a1f8b07cb9e2fbdebe SHA-256: ef524d85f12ba9ddc3ddb558e48ba89311ece4d7444aea2fdddad3c2077b1da3
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 multiple embedded URLs, with one specifically pointing to 'traffine.ru' and disguised as a search result. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple PDFs, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/123?utm_term=hurdy+gurdy+man+lyrics+meaning PDF link annotation
    • https://site-1207164.mozfiles.com/files/1207164/73345730774.pdfIn PDF document text
    • https://cdn.sqhk.co/didowaba/jbhhgjw/sanajexawudiwatoginikexaj.pdfIn PDF document text
    • https://cdn.sqhk.co/surudije/fhibDie/faxol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454671/normal_5ffe687dda2bd.pdfIn PDF document text
    • http://dibowofu.22web.org/new_breast_cancer_staging_guidelines_2018.pdfIn PDF document text
    • https://site-1174506.mozfiles.com/files/1174506/ski_safari_2_ios_free_download.pdfIn PDF document text
    • https://site-1171851.mozfiles.com/files/1171851/ninja_turtles_cast_1991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444100/normal_5faf871420a19.pdfIn PDF document text
    • https://site-1217406.mozfiles.com/files/1217406/tujinovim.pdfIn PDF document text
    • https://cdn.sqhk.co/niramojiga/Gf9iejj/75195400400.pdfIn PDF document text
    • https://site-1237926.mozfiles.com/files/1237926/rarasovimixejumawabafew.pdfIn PDF document text
    • https://cdn.sqhk.co/patemugimej/52hjdib/anime_wallpaper_phone_4k.pdfIn PDF document text
    • http://detomebokiv.iblogger.org/associations_incorporation_reform_act_2012_nsw.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwifudu/XSGXvhu/zajababitivofezibog.pdfIn PDF document text
    • https://site-1235873.mozfiles.com/files/1235873/vofufaxedosonomofifuzerox.pdfIn PDF document text
    • https://site-1242392.mozfiles.com/files/1242392/how_to_change_date_format_in_cakephp.pdfIn PDF document text
    • https://site-1175083.mozfiles.com/files/1175083/anti_corruption_report.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fujesotes.epizy.com/cessna_150j_parts_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 5016 bytes
SHA-256: cf694d6d649ed7213be844fbf752a8c81d0b22300aa384619f67bfd46e87d834
font_01_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 10076 bytes
SHA-256: 61db42cab7bea55270150e83c6391be8f60cfbbaf2603a5e7c2d7d003aec49dc
font_02_sfnt_off00011755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11755 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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