Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9c70112c668029…

MALICIOUS

PDF

82.6 KB Created: 2021-03-06 09:27:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b383224a8101ee74d1ca1d0e68061882 SHA-1: 6da32f2a967260d4fc328acfa54ea166be2b7df4 SHA-256: 4d9c70112c668029621800829b622e7214f6f8e219a0b32a5cbb7c0c9f59b4bc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded links and the nature of the PDF suggest it's part of a larger campaign to drive traffic or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=solving+literal+equations+worksheet+algebra+2 PDF link annotation
    • http://fenofojerafama.22web.org/cogito_watch_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405184/normal_601e4bf31f2ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453098/normal_5fe8690826ba9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388271/normal_6003c29cf3982.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/programming_in_visual_basic_2010_bradley.pdfIn PDF document text
    • http://tiburozikibuvex.22web.org/19273226469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465402/normal_600b0aeb0b016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376869/normal_5fdc14ca6ab3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381344/normal_603455462671f.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/value_based_education_essay_in_hindi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421354/normal_60137bb2cd17a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_5576a3d130b24e0c811624497b5f9324.pdf?index=trueIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_f2de47198ef34bb3a9cf820ffa07c549.pdf?index=trueIn PDF document text
    • http://dikokek.epizy.com/new_movies_2018-_19.pdfIn PDF document text
    • http://vizeroxati.rf.gd/app_explainer_video_templates.pdfIn PDF document text
    • http://sabixukavizom.myartsonline.com/56367916343.pdfIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_5602a8eff6ca4b4db71fcac6d4e83317.pdf?index=trueIn PDF document text
    • http://vapovalexuma.epizy.com/catholic_wedding_mass_program_template_word.pdfIn PDF document text
    • http://tovajukoxeboder.epizy.com/incognito_caller_id_mod_apk.pdfIn PDF document text
    • http://xonelamurojili.rf.gd/8680788682.pdfIn PDF document text
    • http://nivunurawusaxo.rf.gd/what_is_the_best_acurite_weather_station.pdfIn PDF document text
    • http://nudobovedazopor.epizy.com/what_is_the_number_for_walmart_human_resources.pdfIn PDF document text
    • http://livirava.atwebpages.com/17103735913.pdfIn PDF document text
    • http://gigoxasogoteje.epizy.com/beautiful_now_zedd_remix.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_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 5664 bytes
SHA-256: d57474550e812fd9af10343d0a344ffdabe306130fa484219174eda9f12f1b9c
font_01_sfnt_off000116fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FC 11232 bytes
SHA-256: e28a4d4986d6733cfdcfd8ca8c063849860367634376b635d802e493739ee761