Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e95213076040c28…

MALICIOUS

PDF

84.2 KB Created: 2021-02-20 15:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 14b5e2f4f677d5570ca4a9b7238ad620 SHA-1: 35d3e0b02239e5556d2d3a9b91dca2cdd5990065 SHA-256: 4e95213076040c28776a73885ec02d1de71b15ca35d6d7917ef8f652c34119f9
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external URLs, with one prominent URL (`https://baarspo.ru/123?utm_term=ego-t+vape+pen+blinking+15+times`) being a key indicator of a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a tactic to obscure malicious links within a large number of disposable domains.

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://baarspo.ru/123?utm_term=ego-t+vape+pen+blinking+15+times PDF link annotation
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/2451190.pdfIn PDF document text
    • http://shoop-fr.ru/field_attachment_report_cover_page8kv9g.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/304ad486f710.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390381/normal_5ff0b4e86a8c1.pdfIn PDF document text
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/vogox_fivudupewi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391893/normal_5ffe9e6352da9.pdfIn PDF document text
    • http://praktika-ingenieur.com/vuxuwezovgztos.pdfIn PDF document text
    • http://detonic-italy.website/rich_forever_3_download149m3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5fe75ab568569.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417033/normal_60089565738b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458394/normal_5fe809fbc6616.pdfIn PDF document text
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/813b9a01.pdfIn PDF document text
    • http://titanovyi-filtr.ru/mipc_camera_troubleshootings2nxs.pdfIn PDF document text
    • https://vigijamavo.weebly.com/uploads/1/3/0/9/130968937/duleninadikudelarum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461763/normal_601dcc067ac3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sobemub.epizy.com/examination_day_henry_slesar_questions_answers.pdfIn PDF document text
    • http://zuwosopawekaz.rf.gd/sasilizikamupenuzudivup.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_off00010a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A62 5472 bytes
SHA-256: 384939d08cb28efd83960a671f0a1e4632bde4cae4435c2cccae3072c9c3e7a8
font_01_sfnt_off00011d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0F 11332 bytes
SHA-256: 3a838f9ed3132044211c0b9edf5f1a72046b0fa7cabad5f7319a28a2078fa239

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