Malicious PDF — malware analysis report

Static analysis result for SHA-256 367397e01b2ef87b…

MALICIOUS

PDF

85.9 KB Created: 2021-03-31 08:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09ee251c6a82e844729a7956bed78380 SHA-1: 705c8cf15cf0c38e44f03e9b30cdcd0bd1543410 SHA-256: 367397e01b2ef87befbacf54c612389cd3f48ef15820c27807ab34ca3567f5ec
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, and uses a book summary lure. The presence of external URIs and link farm heuristics suggests the document is designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

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://nipisod.ru/aws?utm_term=summary+of+a+beautiful+mind+book
    • https://wivixovipi.weebly.com/uploads/1/3/4/4/134442696/8098046.pdf
    • https://static.s123-cdn-static.com/uploads/4464078/normal_5fffb86e3806d.pdf
    • http://fionainthefield.org/lamaziwizb0b9.pdf
    • https://bafizotadax.weebly.com/uploads/1/3/4/7/134761596/9815287.pdf
    • https://sifejolo.weebly.com/uploads/1/3/1/4/131410009/dagoxunipenimazetama.pdf
    • https://cdn-cms.f-static.net/uploads/4473379/normal_60592f562adfa.pdf
    • http://realwockyc.info/three_day_potty_training_not_workinghge5e.pdf
    • https://xerupirep.weebly.com/uploads/1/3/1/4/131408033/beniwig_wepafidowow_fijobobesulemo_lepemivigozo.pdf
    • https://zokamufonokori.weebly.com/uploads/1/3/1/1/131164159/2e5a90b5.pdf
    • http://help-service-support.com/tomtom_n14644_resetdt06x.pdf
    • https://static.s123-cdn-static.com/uploads/4425909/normal_5ffa0d83bb5fa.pdf
    • http://air-calm2.club/kfc_job_application_form_online_apply_now4chp2.pdf
    • https://static.s123-cdn-static.com/uploads/4387040/normal_600992b16b961.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_fc4e3fc170654542841254b329f19b68.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5bea97f7-2c56-4795-93c5-e9e6583a5b29/32844287469.pdf
    • https://f171294f-ed7a-4884-a773-1e826a512430.filesusr.com/ugd/20d861_b27c0991f2da4a69aa07df9fc373e278.pdf?index=true
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_f3f1640ffe734fb6b80419c144204945.pdf?index=true
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_3a54c0b34eab48a796533ed250ff7bc5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/69f03705-9900-493c-ab0c-6f0bd5870c23/30513186064.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102d7.bin
a7d335696fe1b634539cdec935546c13ca4b435c01e47b4aae37455b3cc1864e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D7 5168 bytes
font_01_sfnt_off0001144c.bin
3c171dc1d1ecb767aa28ea44c0b92b2863a0acdb2ed31ec5c02b9097268f972e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1144C 11440 bytes
font_02_sfnt_off00013adb.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADB 4324 bytes

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