Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7157cf3859fea3…

MALICIOUS

PDF

81.6 KB Created: 2021-03-02 08:07:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1040426541e826585d917162fcba3a71 SHA-1: 1c615cacdb6b034d7d2b735817fd90d51598ce9a SHA-256: fa7157cf3859fea3cdd5a6e2f201f132d6227e6980d05b650aebc89896b5d94d
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The PDF contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains a title related to 'gross national income per capita', which is likely a lure. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to malicious content.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/123?utm_term=what+is+meant+by+gross+national+income+per+capita PDF link annotation
    • http://ighelpcenter.xyz/hmrc_furlough_online_hotlineadrh1.pdfIn PDF document text
    • http://big-ita.space/crisis_communication_plan_template_social_mediajb54d.pdfIn PDF document text
    • http://sunufosabupes.scienceontheweb.net/how_to_take_permit_test_online_in_new_york.pdfIn PDF document text
    • http://rmk4sale.xyz/doctors_urgent_care_metairieon0an.pdfIn PDF document text
    • https://tokuzulovaw.weebly.com/uploads/1/3/0/7/130740221/farepuse-fedum.pdfIn PDF document text
    • http://idealica-co.site/laxebomixixiwurisuretixhyckd.pdfIn PDF document text
    • http://idealslimitaly-official.site/rovixumaxibetof41f8t.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/chord_chemistry_downloadlfbf5.pdfIn PDF document text
    • https://vasirorikipik.weebly.com/uploads/1/3/0/7/130776585/berakimivaxunelejal.pdfIn PDF document text
    • https://sonoxezepokamev.weebly.com/uploads/1/3/3/9/133999938/269618.pdfIn PDF document text
    • http://pressit.space/4349956706277bwi.pdfIn PDF document text
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/batojamemare-sokowovevogi-bodaxewekinu-tebalikebawi.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/vapite/62673507924.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/xezitotepeduna.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/trasformazione_chilometri_miglia.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/30942109615.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/xulezubovaxoruka.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_off00010318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10318 5600 bytes
SHA-256: 6f81441874165eccbb7d487a365aba3f0ffed11bdaae8255c475ab728bea6936
font_01_sfnt_off0001160b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160B 10180 bytes
SHA-256: ff4b85ec1acb56f4b87079194463b97356809ab60d31384c00e6657f1727f999

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