Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4ed789b118cd55…

MALICIOUS

PDF

72.8 KB Created: 2021-03-23 18:10:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d214a609138a9cf490931bf0206cf686 SHA-1: fc2fa5148b4cdda9015cf694b59ea6d7ffa23054 SHA-256: 9b4ed789b118cd55627c49a326902a7f737e2e1f74e939c7676660c90ee58db6
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, with one specifically identified as a link farm hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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://maypoin.ru/wix?keyword=escape+room+5+level+19+answer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481699/normal_604c9aef6d697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467589/normal_5fd2fda512cda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482426/normal_605245b4788d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_6022a9ec20265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484126/normal_6041777229e98.pdfIn PDF document text
    • http://dodemawaj.iblogger.org/85753955756.pdfIn PDF document text
    • http://wobixoka.66ghz.com/rezodebapuretebarijok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417815/normal_5fe87960a6d75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378405/normal_5fc799e241f5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457014/normal_6013dbfb5c560.pdfIn PDF document text
    • http://vumigix.22web.org/bengali_to_english_translation_book.pdfIn PDF document text
    • http://gexuniganije.iblogger.org/bumblebee_transformers_car_timeline.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mobisojew.epizy.com/how_to_convert_kindle_to_using_calibre.pdfIn PDF document text
    • http://kuxogazixup.rf.gd/gmp_checklist_template.pdfIn PDF document text
    • http://bavalibonoz.rf.gd/karuzerumogowumiwoke.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/piriformis_muscle_spasms.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/focus_imaging_centre_green_park_online_report.pdfIn PDF document text
    • http://felepav.epizy.com/gesuvogupupakibobopit.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/34812546762.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_off0000e0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C3 5520 bytes
SHA-256: b7d1d75d63020b4e7416c9e302d8666d88ae599a75f8a6f8b4526fc70b7b7745
font_01_sfnt_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 10168 bytes
SHA-256: 8fcca4aed889d9659e65401072f0cdc896e771a81aa9ae71433edf1bce8cd0ce

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