Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf2e379efc6d704…

MALICIOUS

PDF

72.4 KB Created: 2021-02-14 16:29:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e95a867db944e9d41d3e56fab2171fd5 SHA-1: 667d3228f3727ccc53c72c410031f99aae272894 SHA-256: acf2e379efc6d70489840c4d6b188a8b32243aa2d5af6c3ef5aaa2a93bb53c8e
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/aws?utm_term=breathes+there+the+man+verse+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420589/normal_601210fc53015.pdfIn PDF document text
    • http://gatorama.site/railway_qr_code5aog3.pdfIn PDF document text
    • http://vemasujananexu.22web.org/34632916827.pdfIn PDF document text
    • http://appless.space/little_alchemist_knowledge_combosb4sfl.pdfIn PDF document text
    • https://cdn.sqhk.co/demexadol/gchchi0/e_spanish_accent_alt_code.pdfIn PDF document text
    • http://prod-fruit.space/photonic_crystal_fiber_bookzysiv.pdfIn PDF document text
    • http://neo-tp.ru/amar_o_depender_completojhr5o.pdfIn PDF document text
    • http://futotesu.iblogger.org/67054593044.pdfIn PDF document text
    • http://abanca-electronica.com/jewejulakfwyye.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375908/normal_600af3be58f9f.pdfIn PDF document text
    • http://scm03.ru/what_bra_size_is_mia_khalifaemdwf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bibobega.epizy.com/mu_cv_ting_vit_file_word.pdfIn PDF document text
    • http://ratotepuno.rf.gd/autocad_2018_textbook.pdfIn PDF document text
    • http://jabepujun.epizy.com/22159938169.pdfIn PDF document text
    • http://mutodavop.rf.gd/54371665799.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_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 5084 bytes
SHA-256: 1fb7ae91a018237e735efc2c8c076f394319142eb5f795d7b4698228ef87428e
font_01_sfnt_off0000ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 12768 bytes
SHA-256: c24af083e725e0cf25c78223f3cc0548e2cdbc83d6c9d044f6e866ea5770022f

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