Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2858ecfe88d0b17…

MALICIOUS

PDF

72.6 KB Created: 2021-01-23 12:39:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e37f796939a78800203d94073c66b066 SHA-1: e7bc3422f0bcb7b85c72496281eda2817993f2a6 SHA-256: e2858ecfe88d0b17e3ead4959f752e1113c5b9472d1a1d0ee1fa866e9b06f66f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/123?utm_term=tucson+high+magnet+school'. ML classification and ClamAV also flagged this file as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to lure the user to a malicious site, consistent with phishing or malware delivery, and the PDF format itself can embed JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/123?utm_term=tucson+high+magnet+school In PDF document text
    • https://static.s123-cdn-static.com/uploads/4480173/normal_60074f584d1d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370299/normal_5ff2bc9d01550.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379722/normal_5ff0b2fa1b1a6.pdfIn PDF document text
    • https://site-1195159.mozfiles.com/files/1195159/auctionzip_mansfield_ohio.pdfIn PDF document text
    • https://site-1166671.mozfiles.com/files/1166671/nuclear_chain_reaction_definition_chemistry.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485699/normal_5fd94df1a1edb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463538/normal_5fce8136c0618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490129/normal_5fe76c6c24a67.pdfIn PDF document text
    • https://site-1241975.mozfiles.com/files/1241975/54189005649.pdfIn PDF document text
    • https://site-1167978.mozfiles.com/files/1167978/xarununape.pdfIn PDF document text
    • https://site-1166621.mozfiles.com/files/1166621/bike_race_free_mod_apk_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://selifesupenikiv.epizy.com/gathering_dreams_income_report.pdfIn PDF document text
    • http://rupeguv.epizy.com/google_sheets_fit_column_width.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/hvac_duct_design_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/carlow_credit_union_annual_report.pdfIn PDF document text
    • http://timavutiziv.epizy.com/neregasufiluvuboluvipe.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_off0000e09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 5064 bytes
SHA-256: 119107409a9bee9f8247f4435a20b85023cf72c7fd6fed73704aa2d033b1d44c
font_01_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 10576 bytes
SHA-256: 893b032a3692d4c5295104b755c9fb885228cf27ad4fb3d03665975afb1154ff

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