Malicious PDF — malware analysis report

Static analysis result for SHA-256 37df208f7eceac90…

MALICIOUS

PDF

75.3 KB Created: 2021-03-20 17:20:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6442debda45d55f8dd3fdc525ef2fcc1 SHA-1: 0714c07a3caf98b52d2dd3f6e888bb867549d915 SHA-256: 37df208f7eceac907c1f1fbbd5e25ac0011730cfe35f4782e6d2aef6878796f8
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that is likely used for phishing or to host a secondary payload. The document body, though heavily obfuscated, suggests a lure related to medical information, aligning with common phishing tactics.

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://jacksth.ru/award?keyword=hernia+inguinal+gpc+pdf PDF link annotation
    • http://firstreadersclub.com/86907279284gtfo3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452217/normal_6015d3b621186.pdfIn PDF document text
    • https://nanivenom.weebly.com/uploads/1/3/0/9/130969334/6a187.pdfIn PDF document text
    • https://wivikomale.weebly.com/uploads/1/3/2/7/132740486/a0c98a58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481406/normal_60322d8f0f3cc.pdfIn PDF document text
    • http://vitezozikupu.iblogger.org/thomas_troward_the_hidden_power.pdfIn PDF document text
    • http://gojoges.iblogger.org/candy_crush_jelly_saga_apk_old_version.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367964/normal_5fe1950e2e184.pdfIn PDF document text
    • http://centerbluebadge.com/ley_de_armas_2020_ogpqp3hn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401555/normal_5fe1c1ef8b3d2.pdfIn PDF document text
    • http://detonic-official.website/errorless_biology_2019_downloadha8r5.pdfIn PDF document text
    • http://naturebiolog.fun/how_to_turn_heater_on_acf787h.pdfIn PDF document text
    • http://vijasoga.22web.org/41118314967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_604d28b0b5f49.pdfIn PDF document text
    • https://tuwowezofe.weebly.com/uploads/1/3/0/7/130775341/gunowuxobokuko-vidabuxasuki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puligop.epizy.com/wordpress_newsletter_plugin_contact_form_7.pdfIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/puzezejarikanegez.pdfIn PDF document text
    • http://tofolusobovuv.epizy.com/vogorogirizomesomakodis.pdfIn PDF document text
    • http://sogurorirerew.onlinewebshop.net/reach_mahjong_rules.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_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 5108 bytes
SHA-256: 727a8709abd88b0ebf219296138c513c0b157d7f36fcdcc5b6de22755605486a
font_01_sfnt_off0000fd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 10156 bytes
SHA-256: cf981f99790adf0570f16e8785770fda2379f0ed33963356f84d103b4352a269

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