Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e24eec591d7f14…

MALICIOUS

PDF

79.1 KB Created: 2021-04-13 00:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1424c524a7bdcc6dd761f0531b7c02bc SHA-1: 98ce435912ce60960ee3de0a9d30af9dfc77dd18 SHA-256: 37e24eec591d7f14dfff12cfb58c4cf82b79d237fbb3b0214602ada3b3504d97
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ML classification and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external URIs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=how+to+crochet+socks+for+adults PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368788/normal_6020b6fa971bb.pdfIn PDF document text
    • http://alex-travel.moscow/osac_el_salvador_crime_and_safety_report1pp1q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475739/normal_606d6507acdf4.pdfIn PDF document text
    • http://trycabinets.xyz/kugekojivedidano762js.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457861/normal_5ffa3f2f6ca1d.pdfIn PDF document text
    • http://goodxday.xyz/forigukaxuxhck2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495055/normal_602b85456bddc.pdfIn PDF document text
    • http://naturaitalia.space/22105956708qo1d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_6039deaf14dc0.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/c249fe51-dbd7-4d9f-8099-766b93ff3999/where_to_put_usps_customs_form.pdfIn PDF document text
    • http://gunuguduwurenog.epizy.com/segidisoxan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0110d94-04a5-4aa2-b3ac-126e3577db3e/crossfit_workouts_at_home_without_equipment_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f76d2da8-e45e-4b8d-baa7-fb36d106e7c1/85707137427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0a9009e-2bfe-4e87-bd04-cc635c159468/18407901925.pdfIn PDF document text
    • http://famebod.epizy.com/69921209194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a87f67-43e7-428b-ad87-f009f5a57cfd/why_is_lennie_lonely.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c3eab1-4f60-443b-9b86-ae9386cd4048/sabaninifososasexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72bd9685-418c-44fd-be6f-3594e2c2cac5/pathways_phonics_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2e9478c-d31b-45ff-95fa-eaa1796cb78e/how_to_reset_iphone_4_to_factory_settings_without_apple_id_password.pdfIn PDF document text
    • http://pubometev.rf.gd/60529593887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73e24d3f-7d09-4f77-8379-74009a32eb4e/libro_historia_universal_1_santillana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17ffa7ae-4a70-4caf-b811-3a8b94d9f9c6/radobibevapuxofoke.pdfIn PDF document text
    • http://mizujem.epizy.com/92090755712.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_off0000f8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D6 5228 bytes
SHA-256: 99cd5de67924c4a41f0c49b556a8aba7b95263b4056d20a713c7e6301e59676a
font_01_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 10732 bytes
SHA-256: 58c46d2584b9671ea3fea1053a86608e1c4abe7ae6b2363d8ed9d9a2a0ac2bf1

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