Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe961316124ca04…

MALICIOUS

PDF

76.0 KB Created: 2021-05-30 22:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0bcbe72bdfb25d16b8a1251e795e21c4 SHA-1: 53a4ec4c0c2194b74d66cd0a769a02b6ab7475b8 SHA-256: 8fe961316124ca04f7b4b4c527db2ed657595b04007e094fa85beccc4bbf85fa
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://baarspo.ru/strik?utm_term=solution+complete+de+zelda+majora%2527s+mask PDF link annotation
    • https://vadisasezex.weebly.com/uploads/1/3/1/1/131163908/duriwofolo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478415/normal_604ec75c3d22d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465709/normal_60693e4fdf3b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393179/normal_60259e45807c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393019/normal_5ffe9e516daf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_600c758eed6b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501804/normal_606b7a983916c.pdfIn PDF document text
    • https://povixifanob.weebly.com/uploads/1/3/7/5/137517449/zatagobupegufe.pdfIn PDF document text
    • https://likiroji.weebly.com/uploads/1/3/4/5/134526819/rasodufar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412900/normal_600180ad0e1e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426071/normal_602aacfb957f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389394/normal_6003b0b278ec6.pdfIn PDF document text
    • https://forelidik.weebly.com/uploads/1/3/0/7/130775511/vadopipitolexivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404488/normal_5fe91e34cf8a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482636/normal_5ff21e12e3ebb.pdfIn PDF document text
    • https://tonukujile.weebly.com/uploads/1/3/1/8/131857071/vufinununarovi_naguxotadosuxid.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/8e1faad5-62d9-469c-9dfc-7757758b6827/math_order_of_operations_rules_exponents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b23b090-92e6-4daf-9fcc-07068c8a4236/how_to_connect_jbl_bluetooth_speaker_to_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb6a12d0-f421-409c-857a-53e7e6be2fc7/effective_communication_in_health_and_social_care_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59aa1705-3fa6-4523-b6dd-6841d4ab70fe/844459471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc4df508-8417-4717-9017-6af2430f0b4d/vabajevepevavudizezuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f837737-c4ca-4136-8eea-85cdc74f95ad/what_is_the_importance_of_knowing_the_steps_in_writing_a_persuasive_essay.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_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 5548 bytes
SHA-256: fe351f0fe692a2c59d0a308ace739e1e9d7171faed36a7370dc8d02bb092d921
font_01_sfnt_off0000fe6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6A 11168 bytes
SHA-256: cd6abcbccb252758fcd7007198312f9fc1ef8cebbdede32788e8b7d2ef14bd35