Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c6c1b7eb449b10…

MALICIOUS

PDF

74.0 KB Created: 2021-02-28 00:49:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1ab5cce86a29c7320f2cffc55211b7f9 SHA-1: 775e52885ccada4544a1cefb7ec5d34b943602e1 SHA-256: c3c6c1b7eb449b104f3c0906f8d5ee88dd6d0239e150390c5d8f45edf6e34756
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, and the ML_NYX_PDF_MALICIOUS score is very high. While no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to redirect the user to malicious content.

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://leonvi.ru/wix?keyword=hvac+uv+light+facts PDF link annotation
    • http://repaircreditscore.info/42770350256050si.pdfIn PDF document text
    • http://8gusevshop.space/camouflage_skins_in_fortnitexe4bf.pdfIn PDF document text
    • https://ranemexamegen.weebly.com/uploads/1/3/4/4/134440137/lijidukeginidutaz.pdfIn PDF document text
    • http://megalit-korolev.ru/971171142469rva5.pdfIn PDF document text
    • http://apparently-home.com/bearcat_scanner_bc355n_manualf6489.pdfIn PDF document text
    • http://lasleymarkt.ru/cashalo_application_form6tql6.pdfIn PDF document text
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/webikad_dasavo_wezari_xabofufozirili.pdfIn PDF document text
    • http://sodahq.club/2nd_grade_2_digit_subtraction_with_regrouping_worksheets7rknk.pdfIn PDF document text
    • http://makamar.xyz/pibojimelifabobiruraf088w6.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/skip_the_dishes_app_apku7hh3.pdfIn PDF document text
    • https://mipolokipum.weebly.com/uploads/1/3/5/3/135399848/sojapaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fiwofitobuz.rf.gd/cdata_android_html.pdfIn PDF document text
    • http://xajizufobuvofo.epizy.com/wizirararaloxur.pdfIn PDF document text
    • http://beverunogi.rf.gd/cat_sounds_apps.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/cnbc_halftime_report_panel.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/pobixasi.pdfIn PDF document text
    • http://gevekesudizare.epizy.com/reading_strategies_for_high_school_students.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/aiou_date_sheet_b._com_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/wawipirinoboxeg.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_off0000e689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 5068 bytes
SHA-256: a904c500b7aa11d98e1b4613a152c8629842b3e8b12e810c247a5a74dce6cc4e
font_01_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 10312 bytes
SHA-256: 7e063a3364b970cc299c8723ac968e766ab3a9a895aeb253e3cab3fa83cadcee

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