Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbc52662bbe5dbc…

MALICIOUS

PDF

130.7 KB Created: 2021-03-18 01:20:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cf4a68d9ea1333e62b87196a79677d14 SHA-1: 3ee482d370c33259fab91ec43be22f1fa91880be SHA-256: ccbc52662bbe5dbccb25cf4fa669dc6c6642f3e6b442de9ab2e06d0cb143e34f
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic firings confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=ab+powerflex+40+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_60292b0d13c85.pdfIn PDF document text
    • https://telapuwelidavov.weebly.com/uploads/1/3/4/5/134519428/zalegozixo.pdfIn PDF document text
    • http://voztrans.ru/biblia_ortodoxaoty2v.pdfIn PDF document text
    • http://avtoshtorki.shop/drudge_report_apple_storepssj1.pdfIn PDF document text
    • http://babysampler.com/kotatavirurefisw8rr6.pdfIn PDF document text
    • http://nekretnine.site/892206231344gd1j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477162/normal_5fd33634e4114.pdfIn PDF document text
    • http://lidzadva.xyz/tv_guide_brisbane_fetchp6ioe.pdfIn PDF document text
    • https://buzoraxuv.weebly.com/uploads/1/3/4/3/134366179/8408817.pdfIn PDF document text
    • http://pibarulajido.getenjoyment.net/kfc_double_down_nutrition_uk.pdfIn PDF document text
    • http://fijubigatusurov.scienceontheweb.net/circuito_bobina_di_tesla.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496818/normal_5fd95a49b5cb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_6022a5839764a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead8bc49-24b3-4a3a-800d-669d6c371aef/where_is_the_lint_filter_on_a_maytag_washing_machine.pdfIn PDF document text
    • http://ketabigumowun.atwebpages.com/how_to_start_civil_court_proceedings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d399f4a-9c74-4a43-95ab-946026ec0bbf/par_quoi_remplacer_la_creme_fraiche_dans_les_pates_carbonara.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/61029511010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3cdae64-8f49-4014-8c50-832b576ad236/mofefugikuvovimopumenes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e635795-491e-4526-b3f5-d93f27f0fbfa/what_are_some_methods_of_teaching.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/yahoo_mail_free_for_windows_7.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_off0001a5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5DA 5388 bytes
SHA-256: 7881c3db084b4d87fe7eaaba1afcc897020007167b09036131dd37c04fd10ae3
font_01_sfnt_off0001b82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B82F 12628 bytes
SHA-256: 26c6f767bfc96097883941ecce730b4e3e927a7e91f9cb76fbaec8e0ea19b559
font_02_sfnt_off0001e367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E367 18048 bytes
SHA-256: e338343561ff07020b209d8ebb2f68671fbe81d225e2c74c3da3913fdba5e746