Malicious PDF — malware analysis report

Static analysis result for SHA-256 370ab6b708f7b86c…

MALICIOUS

PDF

88.0 KB Created: 2021-03-10 19:45:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 78f38a0465b9e667bd535906251ad31a SHA-1: b5f8a67441d07d98ebfbd0cedc8374c0dd952f19 SHA-256: 370ab6b708f7b86c8b97755588718807ef4088b385cc51e4152bbc7c2d572b8d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged as malicious by ML and ClamAV. The document body, though heavily obfuscated, contains references to 'Dyspnea definition pdf' and a URL, suggesting a phishing or scam attempt. The presence of multiple external URIs, including one on 'leonvi.ru', reinforces the malicious intent.

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://leonvi.ru/123?utm_term=dyspnea+definition+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414677/normal_6005dc548e4f1.pdfIn PDF document text
    • http://govnosiakxws.online/how_much_does_a_technical_writer_makenw4u5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473375/normal_60216172356b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419836/normal_5fdd121738dad.pdfIn PDF document text
    • http://particulieres-societegenerale.best/tekonuzevigotuwagoginajgz5b.pdfIn PDF document text
    • http://meetporte.xyz/burnley_college_sixth_form_open_evening0tbo2.pdfIn PDF document text
    • http://giviwopifa.22web.org/how_to_hook_up_bluetooth_to_a_pioneer_radio.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/nagev/hotstar_apk_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2cefcd5-f03b-4362-8524-c5bfc38302ba/cuanto_es_8_gramos_en_cucharadas.pdfIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_224d333f887549719860d47bacb836d5.pdf?index=trueIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_4cd4a1ccd4164813938db419017f1ca6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/5547482328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f0eff0-5fdf-4b5c-ab35-05d1a46f4dc5/foxuviz.pdfIn PDF document text
    • http://susugafof.epizy.com/format_essay_spm_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9084217-b23b-45e8-a57e-22daf0a783fc/pretty_little_liars_indonesia_episode_5_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceeb02e7-e408-435a-8837-b6408a8dce0b/us_navy_warrant_officer_designators.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/oropharyngeal_airway_size_guide.pdfIn PDF document text
    • http://wunekoxewufomaf.epizy.com/snacks_for_diabetics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c158890-75a3-4055-86bc-5305abe3a74d/is_kaplan_gre_prep_worth_it.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/guide_to_fill_express_entry_profile.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_off000117cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CF 5008 bytes
SHA-256: 29c71a651c3eefd1d57f175d8dc8bebd35941a5ebdca85ccbdb0b1e309e14a67
font_01_sfnt_off00012906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12906 12352 bytes
SHA-256: d522be67ee0e061c95e61a7b24fbd9edcba14520d029c2b27bf3538fbb548095

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