Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a78349107f591d…

MALICIOUS

PDF

74.0 KB Created: 2021-05-07 12:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 632ff7e9b1140c0adc519301491a6d01 SHA-1: ca1865a25dbbe3ef43863e8b23316eb6dfaa6c82 SHA-256: a5a78349107f591d7bd19849b93e24bc99090abde2cd0007b0ce4748281992d2
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one prominent URL suggesting a phishing lure related to gift ideas. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan. The presence of numerous disposable hosting links further supports a malicious intent to distribute payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=what+to+get+my+female+boss+for+her+birthday PDF link annotation
    • http://gixitetopes.scienceontheweb.net/38808864813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496005/normal_605418be3d47e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445743/normal_600f832a6431f.pdfIn PDF document text
    • http://gatokin.iblogger.org/information_of_abstracted_empiricism.pdfIn PDF document text
    • http://sodiwemewobigi.22web.org/webigowevuninemixawenar.pdfIn PDF document text
    • http://vedivux.mygamesonline.org/71366692408.pdfIn PDF document text
    • http://lokubakodo.getenjoyment.net/89997602956.pdfIn PDF document text
    • https://cdn.sqhk.co/kukusagufo/ujdQe5A/metformina_liberacion_prolongada_precio.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410416/normal_5ff2bd4c6ae61.pdfIn PDF document text
    • https://cdn.sqhk.co/tofepojafuz/ihiieRB/31007220000.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tepobibofa.epizy.com/4979199114.pdfIn PDF document text
    • http://ziwuxokivob.rf.gd/axis_fixed_deposit_rates.pdfIn PDF document text
    • http://jugugesazo.myartsonline.com/cursus_sterrenkunde.pdfIn PDF document text
    • http://faxevimisosideg.myartsonline.com/rashtriya_khadya_suraksha_adhiniyam_2020_form_up.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_off0000e71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 5576 bytes
SHA-256: 27094335f0a80866791e8a79f01367e712c7ae4a53c404856700380e328288c5
font_01_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 9740 bytes
SHA-256: dd8865130f77b510b9d3041458523c16089a8f3768f6091ab5fb046856b30c46

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