Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e78bf88fb20838a…

MALICIOUS

PDF

69.2 KB Created: 2021-02-23 05:53:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8b4eb805a04ca4e66a2c4de0f184e63d SHA-1: 549a3158946b86436439f40f8936e54b35a29800 SHA-256: 6e78bf88fb20838a0da7414ddafb9dd8813b5f639082a363d347b35c1576b065
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically designed to mimic a search result for a book, likely to trick users into visiting a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of external URIs and link farm characteristics further support a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=electrical+trade+theory+book+pdf PDF link annotation
    • https://xoberaditide.weebly.com/uploads/1/3/4/6/134645794/fopofojowizovufi.pdfIn PDF document text
    • http://muxadar.22web.org/balu_mahi_songs.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/kapovasaduxiju.pdfIn PDF document text
    • http://nalatakojuzali.iblogger.org/43900757659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494661/normal_601574e8e7274.pdfIn PDF document text
    • https://dajikapepexav.weebly.com/uploads/1/3/4/5/134597014/5450938.pdfIn PDF document text
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/nariden-zavoleba.pdfIn PDF document text
    • https://pajobujanij.weebly.com/uploads/1/3/1/6/131606923/5532719.pdfIn PDF document text
    • https://www.futuremanagers.com/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/biology_corner_cell_worksheet.pdfIn PDF document text
    • http://dujenovonufu.epizy.com/39987502209.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/negative_and_fractional_indices_worksheet.pdfIn PDF document text
    • http://tubofebagadupa.epizy.com/dsssb_answer_key_12_18.pdfIn PDF document text
    • http://wuzuvulas.epizy.com/fha_streamline_refinance_without_appraisal_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/tajetifakagofakabaze.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/apex_legends_ps4_cross_platform.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/best_books_to_read_for_beginners_india.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/toni_morrison_paradise_quotes.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_off0000cfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA4 5328 bytes
SHA-256: 0c47ca358ce79b63157dcaa2a08af723133405e3540652a6b7777fd4c00ff050
font_01_sfnt_off0000e1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C3 11724 bytes
SHA-256: 97c79591c1c9dcf964e70b4b641ad7abf90d6d682e8faba55041da4d1c5272b5

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