Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2fa8279a2e6c761…

MALICIOUS

PDF

84.6 KB Created: 2021-01-25 04:39:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 26cdbd81ee8b981a6752f79bbcf53c99 SHA-1: 258189b2af139c10751ae9382cb630f4bb16e070 SHA-256: e2fa8279a2e6c7615d23fa0a2edb41e030caedf9d84128650d238718f2db2d67
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, including one pointing to 'jacksth.ru' with a 'warhammer 40k army builder software' query, suggesting a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for link farms, reinforcing the phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=warhammer+40k+army+builder+software PDF link annotation
    • http://ompala.store/enmarket_bluffton_south_carolina_map_showing_clemsonykryy.pdfIn PDF document text
    • http://romigeguwapefi.22web.org/bazevozevetutowokopuk.pdfIn PDF document text
    • http://potolkilife.ru/5098506794wfaco.pdfIn PDF document text
    • http://coloradocustomelectric.com/states_and_capitals_game_sheppard_software568fy.pdfIn PDF document text
    • https://voxonased.weebly.com/uploads/1/3/1/4/131407877/koruvovuzul_xubigozasuru_mepitorapisokaz_fusotavudax.pdfIn PDF document text
    • http://it50life.pro/family_zoo_the_story_apk_modpvj46.pdfIn PDF document text
    • https://konokuvov.weebly.com/uploads/1/3/3/9/133997141/985947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478932/normal_5fdc7a7c5a1ba.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/9343146.pdfIn PDF document text
    • http://biribekagupelu.66ghz.com/gravitational_potential_energy_worksheet_answer_key.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://woxutonugosafer.epizy.com/mijavimikatazowitunakeni.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/contractor_agreement_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/59303544513.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/cricket_score_sheet_format.pdfIn PDF document text
    • http://kegunujav.epizy.com/besizuwoji.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_off00010b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 5788 bytes
SHA-256: 9d8b352780cec9e4dc8c8b766336103772c8786eed8ed72bc354acac999ab247
font_01_sfnt_off00011ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF7 11212 bytes
SHA-256: fb89530ab7d5a80bd36c79ef1735aae13cf30e623a517b3a0fe2466eba917298

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