Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1a7a2bbf428c43…

MALICIOUS

PDF

107.9 KB Created: 2021-02-02 07:35:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 70da09e2b2d8046f4e6eeda1eeaa4060 SHA-1: 776b34210db9f35f78a374c9bdd765be987b6a18 SHA-256: 9b1a7a2bbf428c4306efa113e589545ba8267a88b1e1f795a7b1599a9c7c04e8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/aws?utm_term=philippine+agenda+21+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385011/normal_601877611ceda.pdfIn PDF document text
    • http://gopubewigofopa.iblogger.org/peaky_blinders_series_3.pdfIn PDF document text
    • http://gramnews.xyz/kugufafoketi4rpuq.pdfIn PDF document text
    • http://secret-empire.ru/64093798832zpk3u.pdfIn PDF document text
    • http://tejafugap.22web.org/theories_of_aqueous_humor_formation.pdfIn PDF document text
    • http://vizit.store/zaboboxibudaxemag8xq69.pdfIn PDF document text
    • http://businessoutsourcing.org/biblia_devocional_de_estudio_reina_valera2ui67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rovuwuruw.epizy.com/jadikan_file_jadi_satu.pdfIn PDF document text
    • http://xumugipetoje.epizy.com/13304081554.pdfIn PDF document text
    • http://lelexuxifu.epizy.com/ssc_stenographer_online_form_2018_last_date.pdfIn PDF document text
    • http://bikilut.epizy.com/87353293804.pdfIn PDF document text
    • http://tinejamuwaki.epizy.com/tijumirajurezebajijero.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_off00016a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A63 5212 bytes
SHA-256: 045a265204a24c963dc38aadd300cf8326f747856eee28ed99609f21f6b0c925
font_01_sfnt_off00017c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C2A 11496 bytes
SHA-256: 79b89b926d5f678a4ef7213e79bcf897c49261c77294f8a353053de00fe3fec4

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