Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e9239975203432…

MALICIOUS

PDF

75.9 KB Created: 2021-06-12 21:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4484259cc6ff91e7c286bf279cb354ec SHA-1: c5673ad893d848b2f84dace2ce5fd582d149b80d SHA-256: a2e92399752034327b8cd51d9f7e1aa2eeff697ec960584f29624c2b1d0c503b
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'smidgel.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, a common tactic for distributing malicious content or conducting phishing campaigns. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://smidgel.ru/pbw?utm_term=astronomia+sound+effect PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382949/normal_600901bacde13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_602b8a8c11ab6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529281/normal_603a25861992a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467926/normal_602f1247ebd53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494165/normal_5feb34ee01dca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391954/normal_6053143052bf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420449/normal_602981e9541d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pezaloribed.pbworks.com/w/file/fetch/144628377/pijigones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/650812ab-3721-4005-9f3c-7622be4f776c/what_are_good_interview_questions_for_teachers.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/f/wugomaduvevatorakegedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44fa4a94-15af-47cf-a4dd-59fb76f01241/give_the_ground_state_electron_configuration_for_oxygen.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/w/file/fetch/144504489/electrical_house_plan_symbols_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c16b7de6-5e0e-4905-bc79-de1391274e50/ganor.pdfIn PDF document text
    • http://vananizi.pbworks.com/f/jeux_bleach_vs_naruto_3.3_snokido.pdfIn PDF document text
    • http://nagomax.pbworks.com/f/does_illinois_allow_religious_exemption_for_vaccines.pdfIn PDF document text
    • http://lovixov.pbworks.com/w/file/fetch/144826632/94741302438.pdfIn PDF document text
    • http://tevidaxen.pbworks.com/w/file/fetch/144682605/fapudemur.pdfIn PDF document text
    • http://lerutokib.pbworks.com/f/tasis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a1e3e6-cd31-4444-9c69-42fb70d66ae7/is_model_y_higher_than_model_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c4c7679-112d-4b8a-a8b9-4d4de762b8fe/jibafivireguropewavenix.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/how_to_find_transmission_code_on_f150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e7a4ca8-b600-4402-be7d-e6abf1622428/target_munchkin_baby_gate_extension.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_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 5124 bytes
SHA-256: 47ab427e651d5b6e273bc6fad640e88de074cc5624570c40562d16316b7ef001
font_01_sfnt_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 10956 bytes
SHA-256: db6d456dbd0c488cd3cbbbcbe5f620aeb8d240b8a66f99a52b835258302ecdab