Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f78f001fb2f4ab…

MALICIOUS

PDF

71.6 KB Created: 2021-02-10 00:30:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 984cc59a7ee9ecea6c3fa604e42e8d71 SHA-1: dfa1616e62c1402fa6af062ae26e42f35e9ab15a SHA-256: b9f78f001fb2f4abcc8edc3c11c378267d9d050e169d13b89421990856c82432
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains and employing UTM parameters, indicating a link farm designed to redirect users to potentially malicious sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=churchill+county+school+district+infinite+campus PDF link annotation
    • http://freefire-gifts.com/reserivokobimolugijekey6osh.pdfIn PDF document text
    • http://babbieshop.ru/bhole_nath_ke_bhajanp003d.pdfIn PDF document text
    • https://vafoguvisijun.weebly.com/uploads/1/3/4/8/134887412/nolomizadize.pdfIn PDF document text
    • http://show-visitor.xyz/dadizigokozogenifumiguy6btv.pdfIn PDF document text
    • http://vkrowl.com/viscosimtre__chute_de_billed3ad9.pdfIn PDF document text
    • https://sulipebi.weebly.com/uploads/1/3/0/7/130739254/nutololutoxejezijada.pdfIn PDF document text
    • https://zunexoxefa.weebly.com/uploads/1/3/5/3/135340588/8194318.pdfIn PDF document text
    • https://jojesiwanoj.weebly.com/uploads/1/3/3/9/133986560/mirelofofomoj.pdfIn PDF document text
    • http://3203epworthcres.com/5972932068pb02r.pdfIn PDF document text
    • http://secureappeal.com/51713850702dks25.pdfIn PDF document text
    • http://sokuzise.iblogger.org/86778318675.pdfIn PDF document text
    • http://tosety.xyz/4983720667377as8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://monulaw.epizy.com/chinese_to_english_translation_online.pdfIn PDF document text
    • http://monufaro.epizy.com/jexezeg.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/funny_call_video.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/aranesp_dosing_guidelines_for_mds.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/ocr_a_level_geography_examiners_report_2018.pdfIn PDF document text
    • http://veguxakafopuvix.epizy.com/10586797519.pdfIn PDF document text
    • http://rujipezoj.epizy.com/rowufexofuwazexiborosere.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/42836742733.pdfIn PDF document text
    • http://rawozenagi.epizy.com/xelemisaxuveb.pdfIn PDF document text
    • http://vavilonogamet.epizy.com/roworezajewidedodamoxumun.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_off0000d7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AD 5404 bytes
SHA-256: 97700d55c25ea0aca292b4016b5afdaa6cb4fc1c2d4d1ef02b355bf9f218b5db
font_01_sfnt_off0000e9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 11060 bytes
SHA-256: c2f1e039ac650e7c9a3825f8dcab306c02abfc224e47e9e8fa12a5964ccf2c6d

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