Malicious PDF — malware analysis report

Static analysis result for SHA-256 231832c03bb1a6d7…

MALICIOUS

PDF

117.0 KB Created: 2021-03-14 14:56:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: ba1ad712137645fc916c0f188c9722b8 SHA-1: c558b6572905209b85902cbe7e67ff54bd55ed29 SHA-256: 231832c03bb1a6d744e9eb85ddbdd6edc5b5d8adaa3d86137f08b3928d07888c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or SEO poisoning campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/award?keyword=beauty+and+the+beast+original+story+pdf+french PDF link annotation
    • http://dukofinezamidol.22web.org/28457932249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505837/normal_604654474ab97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529024/normal_600f749e92738.pdfIn PDF document text
    • http://difavusimope.iblogger.org/kabootar_wallpaper_photo.pdfIn PDF document text
    • http://divasamuzive.iblogger.org/42480884632.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421627/normal_60094027aec84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477139/normal_6011725da26ee.pdfIn PDF document text
    • http://radanugogajakax.22web.org/3835036218.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459188/normal_5fed4893c14f9.pdfIn PDF document text
    • http://bukibiroxofin.22web.org/countable_vs_uncountable_nouns_worksheet.pdfIn PDF document text
    • http://nelitip.22web.org/blossom_blast_saga_hack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuxirifuv.rf.gd/windows_server_2012_r2_cumulative_update_october_2020.pdfIn PDF document text
    • http://kanisal.epizy.com/bumblebee_quotes_transformers_age_of_extinction.pdfIn PDF document text
    • http://zagifotezob.rf.gd/how_to_hard_reset_iphone_5_se_without_computer.pdfIn PDF document text
    • http://palisenedabelo.epizy.com/6079069124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3ebbfd-69c5-477d-a14e-0bc36fde0d45/el_poder_de_la_oracion_persistente.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae8d0b5e-532e-4de0-8d8d-02257af4a0df/define_capital_budgeting._what_is_capital_budgeting_techniques.pdfIn PDF document text
    • http://bidexegope.epizy.com/39122011519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b481af-9129-40a5-b12b-7aa258d89578/xubibas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f2d42a-c7e1-4f7f-8980-28a1d8981ecc/47597465689.pdfIn PDF document text
    • http://fizanotafogibag.rf.gd/42164913367.pdfIn PDF document text
    • http://genosumexeser.epizy.com/bandit_150xp_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EBF 5708 bytes
SHA-256: 528cc940522beccdbaf57e291ec09a590b957495462dffd012b99715112a3ce3
font_01_sfnt_off00019229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19229 18500 bytes
SHA-256: 3b583e1a360b452b27790606bd2ac445c6a3697491b78ef2c3b45f51de4c0aa6

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