Malicious PDF — malware analysis report

Static analysis result for SHA-256 801bf5f977ec180c…

MALICIOUS

PDF

173.3 KB Created: 2021-02-04 23:52:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 363e515d00972bd9b589cf38bcf8d4f2 SHA-1: 2456d809054f74a73873a24806243ba4b9e3427b SHA-256: 801bf5f977ec180cb23708984dd167493e3095ffcb5d9e74a0f91f2bf7f502e6
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with one notable example being https://baarspo.ru/123?utm_term=logan+square+arts+festival+hours. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the structure and URL distribution point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=logan+square+arts+festival+hours PDF link annotation
    • http://gikadoketu.iblogger.org/61467690947.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/eLwfhjC/free_online_spelling_test_for_adults_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/hbxijvB/diy_fake_nails_at_home_no_nail_glue.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/guMhEYw/37463609409.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rugadugekowe.epizy.com/fodirudofejevarirolomipal.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/antichrist_movie_link.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/baveza.pdfIn PDF document text
    • http://wipapirub.epizy.com/tagijif.pdfIn PDF document text
    • http://teditobu.rf.gd/xesometumuxapenuji.pdfIn PDF document text
    • http://tuganireriwem.rf.gd/where_does_acknowledgements_go_in_a_report.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_off00026e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26E01 5156 bytes
SHA-256: 2639d04ca49403a52061717b0d3339bd944c15b320892d60d6932fe915938758
font_01_sfnt_off00027f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27F93 11856 bytes
SHA-256: f08e35c478177aef192688337f6f3c49737c046fa6e016d4c3193c54f2d2e4d3

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