Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae33d1decf90951…

MALICIOUS

PDF

75.1 KB Created: 2021-03-21 11:48:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b93eb379fc6e33ae810841dd5279da67 SHA-1: 20044c339c96b76d37243c9f1a4b90ff43a9b58f SHA-256: eae33d1decf909517765065bde62451c215c5982bd59b65134918eab539c4e89
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/wix?keyword=runescape+mithril+dragon+guide PDF link annotation
    • https://bidubemawekewar.weebly.com/uploads/1/3/0/8/130815124/xafumiv-zujobema-temawefabas-pemanavaseza.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/barrons_ap_calculus_chapter_3_answers.pdfIn PDF document text
    • http://kevarusakoko.mypressonline.com/2017_scag_tiger_cat_2_review.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/shorter_oxford_english_dictionary.pdfIn PDF document text
    • http://xupokaxe.medianewsonline.com/bp_344_accessibility_law_philippines.pdfIn PDF document text
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/mavoguzuxurero_wuresin_biwixeka_biwulirapis.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/action_verb_worksheets_for_kindergarten.pdfIn PDF document text
    • https://wosefekolejareb.weebly.com/uploads/1/3/4/3/134340916/5921156.pdfIn PDF document text
    • https://papilezuserif.weebly.com/uploads/1/3/4/4/134437149/d89dca49.pdfIn PDF document text
    • https://gomopurijovovuj.weebly.com/uploads/1/3/5/3/135390772/5597591.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/5e29bef7-c63d-49e5-8e6c-90755f7f8d05/should_i_refinance_mortgage_to_15_year.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/851bdec5-031c-4101-bdde-89f2f4c2c450/polar_coordinate_paper.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_024cd9b6928a4dcaacc49548232f48a7.pdf?index=trueIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_7d0e0271c9a34799a4aa31b1e59d5e8c.pdf?index=trueIn PDF document text
    • https://f44f9643-67c8-4f42-8b6e-e794b3cce972.filesusr.com/ugd/607883_dac1dd613c3c4c0a930ecd1c98d55d9a.pdf?index=trueIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_3d39cc352a3740fb8d4aae7536625bab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/841576f8-5bcb-45be-bd2f-78d2e853e94c/project_manager_salary_in_atlanta.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_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 5496 bytes
SHA-256: e6c64a2cfe26d7c5661917d2663105291e178fa1de7730d6801da7f56c13fd06
font_01_sfnt_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 10868 bytes
SHA-256: 6126dc57a5f2d5da38ee7e5cd1f298ff2b58d6552faf9dcb902d95ea67ebea60

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