Malicious PDF — malware analysis report

Static analysis result for SHA-256 5193457594afb6fc…

MALICIOUS

PDF

76.7 KB Created: 2021-05-13 03:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d36d8898624c3311eb8ad987f45727f7 SHA-1: 6e2e020a17a1707f10d2e899499e16025eda2881 SHA-256: 5193457594afb6fcf3aed234623a54f444cd66d1078cd70fe299f0f987eaeb6d
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains a lure related to 'soft hot tubs' and urgency language, suggesting a phishing or scam attempt to drive users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=are+soft+hot+tubs+any+good In PDF document text
    • https://static.s123-cdn-static.com/uploads/4461744/normal_5ff7c1dd81c92.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/jM9Kigg/61450971316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471082/normal_600a907354242.pdfIn PDF document text
    • http://just-gopro.com/296076366211uh4n.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/lgjhhfy/huawei_honor_uk_store.pdfIn PDF document text
    • http://ruszaimclub.ru/white_rodgers_thermostat_no_batteryswoqp.pdfIn PDF document text
    • http://nukicew.xyz/74442252961qliak.pdfIn PDF document text
    • http://vabebimubu.iblogger.org/miller_dialarc_250_ac_dc_stick_welder.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446930/normal_5febf6b3d7fa7.pdfIn PDF document text
    • http://razixir.22web.org/84302431876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489264/normal_605c2e28ed3e3.pdfIn PDF document text
    • https://cdn.sqhk.co/livejizilul/oXSo51P/64413799757.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/cash_flow_report_sample_excel.pdfIn PDF document text
    • http://sefutuda.epizy.com/nagini_dance_dj_remix_song.pdfIn PDF document text
    • http://fosisidevafepet.epizy.com/16717823106.pdfIn PDF document text
    • http://niwepikos.rf.gd/25624854213.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/ffxiv_aetherial_wheel_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/dilig.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_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 5368 bytes
SHA-256: e2564b9d049401635e181d7faa834c948aaaf2c6b45128594918389a5ba9f6be
font_01_sfnt_off0001001f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001F 10968 bytes
SHA-256: cefb1b934e72436b2a284b3aa71d8fee7d820bb2207e6c8e622993452dcc146b

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